A list with people you don't want to play with
I do not know how to properly word this suggestion, but lately me and my friends have been getting harassed by the same couple of people in the official servers. They will actively seek us out and cause trouble. A great solution to this would be to have a list in which you can add people to a personal list, which prevents you from joining a server they are in, or them from joining a server you are in. This prevents hard to report stuff, harassment and it increases the happiness of players. Because frankly, I know me and quite some other players are tired of getting harassed or being forced to swap servers once they see certain people join.