After watching a clip of what television show Glee did to Mariah Carey's I Still Believe and Nicki Minaj's Super Bass, I have no option but to conclude this was a joke that I, having not watched the entire episode, wasn't in on. Just listen to the arrangement on the Mariah song, if that wasn't hilarious enough they've thrown in Darren Criss' dancing to guarantee laughs aplenty. I mean, what other rational conclusion can a person come to after watching this? That it was supposed to be taken serious? Don't be silly!
If it wasn't enough that they butchered a Mariah Carey song (well technically it's Brenda K. Starr's song, but the Mariah version is the one mentioned on the Glee Wiki page), they didn't even have the decency to honour the Diva with a whole show for her material, like they did with Britney Spears and Madonna. The nerve!
As for Jane Lynch and her take on Nick Minaj: she can do whatever the high-C she wants and it'll be okay with me, but her on the bike was hilarious.
Watch at your own peril, people!