There's a catch with FP, where many of their implications impose you to write better code. But it's not mandatory to go the functional way to do that, and I always try to explain the importance of those fundamental principles to other people, and they can try to implement it in whatever style they desire.
But when someone just doesn't want to learn, they always see me with a smug and gatekeeping attitude and I can't help but see them as people that just don't care at all.