Ok first off if you are adopted that does NOT mean by default your parents are gay. I have several friends that are adopted because their parents just wanted to take a kid out of that horrible system.
Secondly, it is NOT a freakin choice!!!!! Several lgbtq kids get kicked out of homes and are forced to live in the streets every day. Don’t you think they could change that if they wanted too? It is true you can decide who to date, as a mostly closeted bi, I choose to only date guys right now (mostly so my parents don’t know but whatever)
So yeah you are completely wrong, take your homophobic opinion and shove it up your ass