It's not just Glee itself. There's a lot of shows that like to pick fun at things like mental illness and homosexuality. It's not fair, but unfortunately I think we just have to learn to get used to it. Not everyone is going to realize things like bipolar disorder aren't funny or things to joke about, but we can't let it get to us. We have to learn to ignore comments like that, even though it's difficult when they're made. Personally I think that Glee is a pretty wholesome show and they don't do that kind of thing very often, but I'm not surprised that they slipped up. Almost every show does that once in awhile.