That's because NOBODY cares what PETA thinks. PETA is so insane that having them get enraged about your product can actually act as an *endorsement.* That's what happened with Super Meat Boy, the PETA protest actually helped sell more copies.

As I recall the Super Tofu Boy thing was a result of the Super Meat Boy team trolling PETA. I'm pretty certain it was a light-hearted thing, as Super Tofu Boy was later included in the PC version.