Every time you say “You’re not fat, you’re pretty” you are implying that I can’t be both.
You are saying there is something wrong with being fat.
I’m fat, and I’m down with that and you will not ignore my body because it makes you uncomfortable.
I will be fat and in your face and you will fucking eat it up.
I used to get this sometimes. I also used to get the more underhanded version where someone (usually a well-meaning relative) would tell me I have a pretty face, but in the next breath tell me I need to lose weight.