Have you ever seen someone who insults a pop artist or something, then get called out over how they're just jealous or something? I am not going to lie, this really pisses me off, because it's just based off the assumption that everyone who has money and fame is automatically envyable. It really, really pisses me off, I don't understand why people can be so stupid. I know that there's a logical fallacy in here somewhere, but I just don't know what the correct name for it is.

I just call it the "jealousy card".

The technical term is argumentum ad emulationem.
"You are only critical because you cannot emulate their success, yet you wish you could."

It's a garbage argument, yeah.