Yeah, speaking officially as a CA, I'd ask everyone not to directly attack or call out other players
As for the "avoid player function", I don't really see any difference between that and the block button aside from decreasing the pool of lobbies that match maker can put you in. If a player is blocked, you won't be able to hear them, plus they're highlighted in gray so you can identify them and move off their ship if you want. Plus, some of the more grumpy players like... oh right... have pages and pages of blocked players, so quite possibly every lobby would be blocked.
Plus, in my experience any way, serious trolls don't really play all that much before they hang up their game