Well, I'm in the minority, but I guess I'll put my two cents worth in...
"I disapprove of what you say, but I will defend to the death your right to say it" Evelyn Beatrice Hall
I love GLEE, the singing, dancing, silly plots and ridiculously un-PC humor. In fact, Sue Sylvester is my absolute favorite character and a perfect role for Jane Lynch, whose work I have always loved. "Best in Show" was my favorite before GLEE. The only time I was really offended was when they did theme episodes on Madonna, Lady GaGa and Brittney Spears! And that's because I don't like their music..
And to be honest, I thought the grilled cheesus episode was hilarious.
I think that Sue Sylvester is the Archie Bunker of this generation. She is irreverent to just about any demographic imaginable, from advocating the return of caning as a discipline to banning tater tots...which was much more entertaining than Gwyneth Paltrow.

But the real lesson in this comes from the over-the-top humor of the show; it makes it so obvious how ridiculous that kind of thinking is.
If you look at the person of Jane Lynch, who plays that character so well, she's gay and has no problem laughing at herself. I think what I've learned from her personal life is to be able to laugh at myself once in a while and to trust that most people will understand the serious lesson inside the cringe-worthy humor.
__________________
"Better not look down, if you want to keep on flying
Put the hammer down, keep it full speed ahead
Better not look back, or you might just wind up crying
You can keep it moving, if you don't look down" - B.B. King
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