How old is your daughter? I think Glee is fine for kids 10 and above with parental guidance.
My daughter is 9, she was watching together with her mom. Even with parental guidance , when those kind of scene just happens it's too late for the parent to not let their child see it, does anyone expect to see a scene like that to happen in Glee? I can watch together with my daughter let's say Camp Rock, I can sleep thinking the show is safe and not expect to see a girl to girl or boy to boy kissing.
My take is, even an 18yr old individual can watch this thinking or expecting to be entertained in a family oriented or wholesome entertainment,but when you see those things, the show ought to be Rated R already. Imagine an episode with Charice when the entire nation from all ages watching then they suddenly see 2 boys kissing?
Moving forward, it just saddens me that after months of following this series, my daughter, including my wifey suddenly felt bad and opted to stop watching it just because of that unacceptable scene.