I'm sorry to hear that. The most saddening thing about this whole thing for me, is that it has revealed just how ugly some people are underneath (on both sides of the camp). I understand why some Remain people are angry (this is a MASSIVE deal after all with major consequences), and anger is ok, but surely they realised that there were TWO options in the referendum, and that one side has to lose, before they voted? Therefore a loss was always a possibility. So there is no excuse for spitting because "they lost".
Likewise for the Leave side. I'm not saying your mum has been this way (I'm assuming she didn't from your post), but the dismissive and superior attitude of some Leave people towards Remain is also fanning the flames, when the Leave side could just as easily have been outvoted.
People will move on sooner or later, as events in their own lives catch up with them. In the 2008 financial crisis, I was a teenager and absolutely petrified of what would happen, and angry at everyone who caused it. And yes it was a huge mess, but the only option for me was to live through it, even though it was other people's choices, not mine, that had made things harder. Even though I still needed to vent sometimes, I realised that whining and complaining didn't benefit me or anyone around me. I get that some people have a lot of "fire" but there are much better ways to channel it than verbal or physical abuse. Because neither of those change things for the better.