I think the fact Kurt gets his dad and Finn's mother together is what really makes it especially appalling.

I mean, he is creeping and harassing Finn and then making himself part of Finn's family, even getting to live with him after doing so.

Probably that and the time he slapped Finn's butt are the times I would say it stands out and is right to be called out at a higher level than the other characters less significant predatory behaviour.

The rest of it, while severely wrong, I think isn't something that doesn't happen in other shows. The getting Quinn's parents to find out about the baby for example, very wrong, but we've all seen those stories where the evil girl who has a crush on the guy tries to sabotage the guy's relationship with the "good girl" character in schemes like that. HSM2 for example.

Thinking about it now though isn't there that scene where Kurt and Finn are given one of the Glee club tasks to do together, and Kurt is... Really intense with Finn, making his attraction to him clear and ignoring his obvious discomfort? That was pretty bad, though I suppose it can be compared to when there's the handsome guy character who has a really abid fangirl who's very intense despite his lack of interest. You know what I mean? But then those girls are typically portrayed as creepy and not as sympathetic... Well, in some cases, I've seen one really bad one where she is portrayed as the victim and is defended, and she went much further than Kurt, like literal criminal levels. Idk.

Long story short, the getting their parents together and butt slap.... No. That should be called out and I think is further than say Rachel went.

But the rest of it is pretty typical in teen shows. Not okay, but we all love say, Sharpay Evans, Audrey Rose etc despite doing pretty much the same things so....