I have actually seen them ban lots of users for absolutely nothing.... I think when it gets to busy to read any comment properly they just go on a banning spree. Anyone who isn't adding "quality chat" risks getting muted.
If you want a bitcoin trollbox where anything goes... Try visiting CEX.io.. There's a lot of idiots there who just love caps and anything else you can throw at them.
I'm sure anyone who likes the idea of cex has already registered, but just in case you haven't, plz access via this link and i might earn a few pennies:
https://cex.io/r/0/david/0/