Thank you both for your replies. Bipolar Warrior, you did indeed give me some good advice!

I have tried to respond differently but it seems to make no difference so I just give up. Like the other week my parents were making some comments on what I was eating in a way that sounded like they were calling me fat. I was upset by it and my Dad said "they were just teasing me" and said "well I don't like it" and then my Mum responds "Oh diddums". So yeah... that's usually how it seems to go.

I often feel as though my mum invalidates my feelings which is why I like my T so much, she never does that to me.

Also I think "diddums" is a British word but it is basically a sarcastic way of saying "poor you".