JBL lost to Rey in both of his retirement angles. It's completely unreasonable for both of you to act like it was just a commonplace thing. This was the end of his career and he left on his back just like almost every guy who's ever stepped foot in the ring. A more comparable situation is JBL beating Eddie Guerrero when he was on top of the world in the biggest push of his career. JBL would've done the same to Mil Mascaras, ESPECIALLY since we're in the U.S. and not in Mexico.
I see three issues with this argument.
1) You can't really compare Mil Mascaras to Eddie Guerrero in terms of prestige. They wrestled in two radically different times. Eddie Guerrero may have been an international star, but not in the same way Mil Mascaras was. When Guerrero was international, there was still video footage of his accomplishments that could be shared across boards. Not so with Mil Mascaras. Mil Mascaras mostly had to rely on reputation alone to make his name internationally. Which he did.
2) I don't think JBL ever scored a clean win over Guerrero. I'm not going to pretend I know the outcome of every single match JBL had with Eddie, but of the ones I can remember, none of them came cleanly.
3) You act as if JBL's only significant losses came when he was at the end of his wrestling tenure with the WWE. That's not true. JBL played the very important role of being the legitimate guy that developing talents could beat to put them in the legitimate role. But when it came to facing the big name talents, JBL was almost always on the ass end of an ass kicking.