Bischoff & Flair was quite interesting, especially as it stems from Bischoff basically refusing to take Flair's shit anymore and Flair deciding to act like a 5 year old...
What "shit" did Bischoff take from Flair ??? Flair was the one who got Hogan & Savage to join WCW in the first place (and put himself out there losing to them in high profile matches as part of the bait), and lost every time Bischoff asked him too. Flair put over Brett Hart without complaint, put over the NWO in the War Games 97, lost to Hogan in a Retirement Match so that Hogan could have a chance to get over with the WCW crowd without competing for fans with Flair, he did a skit dressed in drag, spent weeks in a mental hospital storyline, and had an onscreen heart attack (In Atlanta, right after Falcons Coach Dan Reeves had one)....all without complaint. If anything, Flair was the one "taking Shit" from Bischoff because he was a rival for the audience with Hogan.
If Bischoff really was tired of Flair's "shit" he had ample opportunity to release him, Flair was in talks with WWE in 1997 when WCW immediately offered him a "Letter Of Intent" outlining details of a forth coming contract, imploring Flair to sign (which would bind him temporarily to WCW while final contract details were worked, ending any discussion with WWE). When no contract was presented and Flair was denied time off to spend with his son (ironically after he had been written off TV for two months without explanation when he was ready and available for work) Flair did complain, and Bischoff immediately sued him. Flair again was in contact with WWE and they were interested, but Bischoff insisted that the "letter of intent" was still binding. WWE even had plans for Flair to appear on RAW in the spring of 98 but were scrapped due to on going lawsuits between the companies and the threat of more litigation. Again, if Bischoff was tired he easily could have let Flair walk, just he did Austin, Big Show, Waltman, & Jarrett among others. Bischoff instead continued screwing around until the "We Want Flair" and "Free Flair" protests got to be so overwhelming he was forced to bring him back. Bischoff knew Flair was a money maker and knew McMahon & RAW would reap major rewards with him so he kept him tied up yet at the same time tried to diminish his popularity and marketability by keeping him off screen as much as possible.
Bischoff was the only one giving people "shit"....just ask several other WCW employees at the time who weren't too happy with his leadership.
As for real life backstage dramas....Hogan & Savage had an on again/off again friendship that was damaged for the last time during their WCW run where Savage felt Hogan used him (Savage was always asked to put over Hogan's opponents so that he didn't have too, Hogan always getting the best of Savage in every face off between them). Savage was VERY vocal about his dislike for Hogan during the last year's of his life, although he was generally complimentary about his other prominent on screen rivals, always complimenting Flair, Steamboat, DiBiase, etc.
A LOT of people did not like Ultimate Warrior, he had a bad rep backstage for attitude and a worse one in the ring for sloppy ring work. While he and Hogan had a legendary off screen feud (mostly fueled by Warrior's internet rants) Warrior had legit heat with Rick Rude, Bobby Heenan, and some heat with Flair for the ear injury he caused him.
Hart & HBK got along well early on, their real life bitterness evolved over time as both were striving to be the #1 guy. Very similar to Dusty Rhodes & Flair although those two seemed to patch up much of their differences. Hart has been very vocal about his dislike for Hogan over Hogan's alleged refusal to put him over in 1993 (Hogan, who has chided Hart many times himself, says he was never asked by Vince to put over Hart, it was always Yokozuna).
Was there ever a better case of real life heat behind the scenes than Arn Anderson & Sid Viscious ....their hotel brawl landed them both in the hospital with stab wounds!!!!
Steiner just rants all the time...on Vince, Hogan, Flair, HHH, HBK, and sometimes even Bischoff, It's hard to tell how much is legit and how much is just for attention. Hogan was the one who OK'd Steiner's inclusion into the NWO angle and character change into his Big Poppa Pump heel persona which was the biggest moment of his career, and enabled him to get a million dollar pay raise from Bischoff. Flair was the one who got him hired in WCW as a favor to his brother Rick when no one else was particularly interested in him, Vince hired him TWICE, not many guys get fired from Vince and are invited back, and booked him in top level programs both times. HHH main evented PPVs against him in WWE, giving him big paydays he otherwise wouldn't have gotten. Not sure why he doesn't like HBK but since seemingly everyone else on his hit list was a major benefactor of his success at some point Im guessing HBK probably did something nice for him too.
Allegedly there was heat between HBK & The Rock back in the 90s, and Rock allegedly refused to wrestle him, no one talks about that much today.