@frostotron I've used 'they' since I was very young. Not because I was especially gender conscious. I still can't wrap my head around gender. My half joke i,"I'm still trying to figure out one gender." But because it didn't seem right to assume male.
I got corrected all the time. I was so happy to here 'they' is starting to be accepted in style guides!
I try to use pronouns a person wants. If I get it wrong, it's not on purpose or meant as slight.