That isn't offensive to people with mental health issues, he's pointing a fact out, and not an insult. Also the W.H.O. should have especially kept wannabe trans people as a sickness, I think doctors and therapists (think how long they worked hard to get that degree) are probably smarter than some person on the Internet like you, ok if you're gay, lesbian and bi you can't do anything about it (kinda is your parents fault with feeding you up), but don't keep talking about it and saying you're proud bc we straight people don't give a shit of being proud of people having a sexuality and we never kept telling people : "Oh I aM sO pRoUd To Be StRaIgHt", as long as we're normal, we're normal (no again normal isn't a insult it's a fact).