I'll jump off a bridge before I cheer for the Trashstros or Barfs.
I feel like there are way too many teams you hate in every sport. I could honestly name far more teams I like (even beyond my favorite team in every sport) than teams I have any level of dislike for (probably only Cowboys, Patriots, Mets, Ohio State football, Notre Dame football, Tennessee football- but only in a "like to laugh at them" type of way-, Kentucky basketball). There are obviously other teams I'll cheer against in a regular season for the purpose of division standings, but that doesn't necessarily mean I don't like them if they make the playoffs.