Non-communicative team players

Lately, I mostly play 3v3. I had some of my best games in those mode.

However, the one thing that absolutely ruins at least 50% of my game are the players that come in a team game, don't type, don't communicate and don't respond.

They come in, start doing sim city, they get pushed and die without saying a word or pinging or anything. I'm busy skirmishing. I look at the map, oh there's a huge blob in my teammate's base. At this point it's 2v3 and the game is over. They don't respond and just leave.

Why do you do this? Just go play 1v1 if you want to do your own thing.

It frustrates me, because it's the single most common barrier for me to get good games.