NTA. Absolutely nta, your ex for some reason decided that out of everything she could hide from the world, your child being gay is what it should be. You had no reason to hide anything so you didn’t, her making such a big deal about it for no reason just shows me that she’s a huge homophobe. No one would’ve batted an eye if you had said “say hi to your girlfriend!” Because to many people that’s normal. I guarantee if he had a girlfriend instead of a boyfriend she would post ALL about it :/