Well... I can already see how this could be turned into a poor situation.
Ex.) Kid who doesn't like me runs up and starts calling me profanities over the overworld chat. Before I can click on his profile in order to report him, he quickly ignores me. (If the "ignore" button is similar to the "block" button).
I understand that you could probably look up his name on the player list, but when someone has a name like "jonthekiller6969" it would be pretty hard to look up if you got immediately ignored and was able to see part of his name before he went invisible.