In the episode 301 "Rainforest Shmainforest" there is an organisation (a kids choir) which advocates for preserving rain-forests. The whole plot of the episode is about Stan, Kyle, Kenny and Cartman being sent (for disrupting Mr. Garrison's lesson) to Costa Rica to perform with the choir on a conference dedicated to forests protection.
I'm trying to understand why the choir is called G.G.W.K. (Getting Gay With Kids).
The last line in the first verse of their song: "Being an activist is totally gay". Is it a reference to one of activist organisations or to activism in general? Is it even related?
P.S. Maybe my non-understanding is due to the fact that I'm not from the US. Anyway, I was unable to find any info on this topic.