How to respond to hurtful text message about my appearance?

I F(21) have never posted a picture of myself, no stories, no posts, nothing. I HATE being perceived, very strongly. Everyone knows this about me.

I’ve been dealing with an eating disorder for many many years and this past year have privately been going through the steps towards recovery with my therapist. So I’ve always been very fragile about my appearance,and I’ve had a rough year especially with my self confidence

today I went out with some friends and for the first time in months I felt pretty, i usually post a cute little story when I hang out with friends and today decided to add a picture of myself although only half of my face lol. I have been working on being more forgiving towards myself and have posted in stories parts of myself but never my face.

I got a story reply by a good friend of mine who commented on the fact that I my face with in a pic. Which was fine but it went from “I like the camera u used to take the picture” to making fun of my hairstyle / bangs.

I just don’t know how to respond, I’m so devastated i know it sounds stupidly small but it feels like 1 step forward 2 steps back by this one text message and I don’t even know how to reply to it. Ofc he doesn’t know the full details of my ED, but why make fun of someone who u know isn’t confident??

Any advice on how I could respond in a reasonable manner, I don’t wanna come off bitter but also I wanna assert my boundaries without being told I’m being dramatic by him.