This is a classic take by a non-competitive player that would be better suited playing PvE or campaign games.

That being said, there's nothing wrong with that. Just understand that when people are trying to win, they have skin in the game, and are investing time and effort to win every game.

> Also, one particularly aggravating part of the community is that it’s considered courtesy to surrender once the front line is broken instead of playing the game out and letting the back eco players try and recover it.

Yes, it is courtesy not to waste other people's time. Not sure where the controversy is, rather than your misunderstanding. Usually it's quite evident whether the game is lost (again, if you are a somewhat competitive player).

> I stopped playing because I felt like I had a lot of negative interactions in every 2nd or 3rd game.

You need somewhat of a thick skin to play competitive team games. This goes just as well for more popular games like DoTA or CS2. It just seems you didn't, but it's not the game's fault or its community's.