I don't like when people dunk on centrists. Sometimes it's fair enough, if the centrist is very aware of the political landscape, is politically active, and has decided to take the side of status quo by "not taking a side."
But many times centrists are just ignorant (well, in my experience) and sometimes they just want to avoid conflict and then say they're on nobody's side. I think it's a bit mean to dunk on someone who is actively trying to avoid conflict.