I've got an ongoing argument with my sister. She owns a fairly large business (100 staff) and whilst not being politically engaged at all (I used to tease her about reading The Daily Mail but she admitted it was purely for the celebrity gossip), she was a big remainer and we as a family often discussed openly how horrified we were at the Leave vote and what chances there were of overturning.
Anyway, a few days after the election one of my kids heard from one of her kids that she'd voted for Johnson. I couldn't believe it and when we were pissed I brought it up. She was really defensive, saying "No way was I voting for Corbyn" etc. I said "You've just voted Leave" and she couldn't even quite make the connection. she was spouting that nonsense about Corbyn being a Leaver and a Marxist and all that.
There were millions like that. Not hugely politically engaged, not even aware that a hung parliament would have resulted in a second referendum and we would have remained. It will take me a long time to forgive Labour's left for that. It was fucking obvious from day one that Corbyn was unelectable for many reasons.