I'm curious

So I had a game today where my Marksman tried to fight a lv1 invade by himself and him and the support that tried to save him died. After which he asked "where is team?".We where across the map doing basic jungle startup. I responded "why? just leave.", he shoots back "easy kills". My response was "they sure where"....he then goes on a two minute rant about how I'm toxic and that I better apologize otherwise he will get me banned complete with a countdown of how long I had to apologize for offending him. Meanwhile his support is trying to hold the duo down there off the tower and asking him to come out of base and play the game. The only things I said to him for the remainder of the game was "sure dude" and "ok".

I'm not really here to ask if I was in the wrong but more I'm here asking how many people on these boards actually think like this? I don't normally care if this game has a rough edged community normally but it was a bit disturbing to run into somebody this entitled when he thinks he has power.