Feel free. I'm going to continue to use "they", which usually fits without violating gender grammar too much.
I use "they" when referring to the third person of a gender-unknown someone I'm not expecting to join the conversation and "s/he" when I am (possibly as a prod to clarification on said person's part). I don't think "xe", which some people have tried to use, really works ... people often think that it was a typo, and the first time I saw it at the head of a sentence I scratched my head and wondered what xenon had to do with any of this.
Daniel Case