Randomly harassing someone and telling them to "kys" unprovoked should result in a permaban.

Just finished a match with a friend and three of his other friends whom I did not know. Two of them were nice, one of them randomly harassed me throughout the game and cursed me out in front of everyone for no reason. I ignored them and told them to stfu, followed by them telling me to "kys" (kill yourself). This should be an automatic permaban for that player, I can't believe people can do this in games. I was friendly to everyone, telling them stuff like "nice dodge!" and "great job!" and other positive things. Randomly, before I even had a death, I was told by them that I suck, am horrible, should kill myself, and was cursed out constantly. Unacceptable and unbelievable.