Exponential increase of trolls in CT

[Nekodar]

or implement another side to the reputation system....like negative votes, or the option to avoid playing with that person in the future. if they were on an avoid list, they'd find it harder and harder to find queues as their trolling continues and people begin to add them to their "do not play with this guy" list.

Negative votes would be abused by trolls.
An avoid list would be nice though, but it could also backfire so that you're the one not getting into a group instead of the one you want to avoid.