[dcole2929]

I agree, and don't necessarily see anything wrong with the use of 'hey guys', but at the end of the day it's a pretty mild request to take a stand on. I can't imagine being that married to a greeting that I'd refuse to consider trying to use other phrases.

Also just because it's generally been a non-gendered term doesn't mean prevailing opinion hasn't changed. There is a lot of talk around changing the norms in which masculine terms are considered the default. Both in english speaking languages and others (e.g. See LatinX)