Season 2 has been much better than season 1 because of them tackling serious issues like this. I hope they continue down this path, and that if it gets too serious for Disney, that they don't cancel it. They can just move the show to ABC Family or someplace like that.
Anyway, I agree with you guys saying it's ridiculous to criticize Riley. I found her antics goofy and over the top at first as well, but at the same time, Corey and Topanga's relationship was goofy and over the top too, yet they're consider the "perfect" couple among folks who grew up with Boy Meets World. And if you think about it, if you had a daughter, why wouldn't anyone draw up Riley as the ideal daughter to have? Not just for Corey and Topanga, but for anyone? She's well into her adolescence and is still sweet, innocent, smart, adorable, loves her family and friends.... I mean, of course the perfect couple came up with the perfect daughter, right? You'd have to be a real jackass to dislike the Riley character.
That said, while I'm sure your source is legitimate Big Poppa Machismo, I actually interpreted the episode as them confronting faceless trolls on the internet who are so hateful and will go to unimaginable lengths to embarrass someone and even ruin their lives. That's why I thought they kept the bully off camera.
And yeah, absolutely, great acting from the young ladies last episode. Very, very impressive.