Yeah, he just snapped. I don't really know the details since I'm never around during those times (I only caught the aftermath of Team Tee Hee, after all), but a lot of threads of sections he modded got deleted over it, and I hear Serebii gathered his staff together to talk about it.
Yeah, I hear Bulbagarden has an awful reputation with its staff in that if you don't share the same opinions as the mods, you can get banned for anything (but I think in terms of badness, it's still child's play compared to other forums out there that I'm not entirely aware about). It's why a lot of people from Bulbagarden have an account here. Serebii has been a great place, I only went AWOL on these forums twice and I always came back because I missed the place so much. Even if some of the mods are "meh", the community as a whole is a lot of fun, I don't recall ever having any problems here. I also give Serebii a lot of credit for helping me grow as a person over the years, and I've come to like and respect people.