Where we were at as a country 15 years ago when it came to homophobia is approximately where we are at today with transphobia in my opinion. It is far too normalised, I'll hear people joke about a friend of a friend of a friend being a 'they/them thing' same way I would hear about someone being a 'bender' back when I was still in primary school.
Like this person you know nothing about has decided to come out as non-binary, one of the bravest and hardest decisions in their fucking life, and here you are laughing at them you pathetic, ignorant, gossiping man-child. Sorry, I just needed to get that out of me.