Yeah I also notice that with myself very often, too! And it’s really not so easy because we’re still humans, driven by our emotions and values. 

And about categorizing each other, in the first place we need to categorize or our brain would be overwhelmed. But what if we shrink the amount of categories? That’s what I was thinking. You could have a category for people that really did you wrong, and one that’s called „just an individual“ and maybe over time, it’s not such a big deal anymore! 
Just a thought… 😊