I enjoyed my time in Heroes of the Storm playing the 'wrong' mode. VS AI Coop is basically five humans against five CPU players. In almost all of the matches I did over a couple of years there, I very rarely never had anyone get shitty... or really, talk at all for the most part. It's kind of astonishing given the reputation MOBAs have, but maybe all of the people you'd expect to be playing were in other modes.
I have no idea if it's still this way or not after the greatly exaggerated rumors of its death, though. VS AI solo isn't worth it since an update a few years ago broke the AI to where they'd do absolutely nothing unless pinged which meant they'd only follow you instead of spreading out or doing objectives. Of course, enemy AI performs just fine!