He said 'You seem happy, cheerful, are social. I don't understand what's causing you anxiety'

I feel very fucking triggered, because I a huge part of my mental health being so fucked (I have anxiety, depression, mild ADHD) is because of my family. I wish I could explain more but it would really take a lot out of me to do so. 

I am at a loss of how to approach this. A very small part of me believes that it's my "duty to educate" him about this statement is so stigmatizing, but a large part of me knows it's going to be of no use, he will mostly gaslight me by saying things like 'calm down, why are you getting angry. We are having a discussion' or simply railroad the conversation and not let me speak. 

I am at a loss of how to politely shut him down and let him know i cannot possibly be explaining this to him. Should I send him educational vids?