Not much can be done about that. When money is involved in every action people get nasty. If you use SteemPeak you can filter out 0.001 messages.
Outside of that, there isn’t any way to stop someone from sending transfers. I’ve been asking for ignore for transfers for a while but I don’t see that happening.
RE: Steem Is Getting Ridiculous With Spammers and Is Causing It To Be A Unpleasant Experience. This message is for all witnesses...