Find your anger about their disdain of you.
But I'm not sure explaining how you feel is effective with a person who would do that.
The whole point is, they don't care about your feelings.
What do you want from this?
Remorse, realisation, (sincere) apology, empathy? Vanishingly unlikely
To effect change? You'll have to be constantly en garde.
To blast them before you leave for ever? Mmmm, that might make you feel better.