Do gender reveals bother you?

I've noticed that people get a lot of hate for doing gender reveals. The comments section on them can be kind of brutal.

Why do people hate them so much ?

I have HG (hyperemesis gravidarum) and while in the hospital I really looked forward to having a little celebration. We didn't do a party or anything but I got some things for a cute reveal that involved photography (since I enjoy that) and shared it with friends and family on Facebook. I honestly had so much fun doing it and my loved ones seemed to enjoy it a lot too. It really brought some joy to my previously nightmarish pregnancy. Why do people get so angry over something that's just meant to be for fun?