I'm sure we've all had the experience of meeting someone rude during a duty finder run. I would like the ability to blacklist these people while in the dungeon so that:

A) I don't have to listen to them insult me further while the run is ongoing
B) I don't ever have to run with them again

Obviously it's impossible to blacklist every rude player ever, but at the least I'd like to be able to know that I won't encounter that particular person again.