I've faced this exact scenario a few months back when I asked some questions on Preact's Gitter. Pathetic. English is not even my first language, I swear I didn't know I'd be offending someone by saying "hey guys" :/
In some languages (I'm saying about russian) there is a written rule for such statements: if just one out of the whole auditory is a guy, you must say "Hey, guys".
Sit back and watch as you're bombarded with threats and comments about being pro-rape, a straight white male and the like