South Park makes fun of everything, pretty much every episode. The circumstances of his death are pretty rare and completely unexpected, so it's not terribly unusual that south park would tease about it.

I don't like the show anymore, and I used to watch it but stopped awhile ago. This isn't that unusual from what I know of south park. Plus they aren't the first on this bandwagon by any means:



This is hard for some of us because Steve Irwin was important to a lot of people here- but what if this was a broadway board? How would they feel about them nailing Barbara Streisand, or anything similar?
Most people will just find the episode funny and "edgy". It doesn't terribly bother me, because his death getting coverage in so many places means that his life mattered and people know who he was.