Just own up to it. Seriously. Don’t freak out, don’t spend time trying to justify whatever you just said. And, HINT: the more of an urge you feel to justify what you just said, the greater the chance that it was indeed very shitty and this is your way of coping with your own shame.
Say, “Wow, you’re right. I’m really sorry, and thank you for letting me know that.” Then, don’t say that shitty thing again.
Yup. Much smarter than, say, picking a fight that goes on for *years* and making up absolutely ridiculous things the other person supposedly did that they really didn’t.
Seriously, appreciate what you look like no matter what you look like. Especially if you’re female. The human body and what it can do are really amazing.
Also, wear a LOT of bikinis before you have a baby because NO, you are not NOT thin enough to wear one and after you have a kid and get stretch marks and saggy elephant skin on your stomach you will really, REALLY wish you had flaunted how great you looked before. (Sidenote: of course, a baby is totally worth the absolute havoc they wreak on your body.)