Soooo upset by rude people!

So a lady in my office just talked about how HUGE I am in comparison to a coworker who is pregnant with twins. Yeah, well I started out way bigger than her. She weighed 100 pounds, I weighed 150. I'm 5'7" she's 5'3". I work out daily... Yes, I've gained 15 pounds!!! And now, I feel depressed about it. Why do people feel the need to make other people feel bad about themselves. My other coworker was like way to go! Way to make her feel bad! 😭😭😭 I already feel self-conscious and gross. Now I'm crushed...