Bird Poo? Isn't that the reason God gave us nails? lol
To be honest, bird poop has never bothered me, but my new Alexandrine, Max, has only ever pooped on me twice, and both times he tried not to by backing up and poo on the chair instead. That was due to me not recognising his signals... He'll start getting restless, I'll put him in his cage, he poops and gets back out.
Max is still a baby, so that could easily change, but that's OK, too.