I have 3 women (20-25 years old) here in the same Office/room and asked them, how they would feel about it (using the german equivalent). 2 of them said they wouldnt mind and dont see it as a gender Thing. The third said that she is part of a mixed Group where this happens and she could not care less. I know, that my girlfriend would not mind.I can't imagine any female being okay with the term "boys". That kind of language is typical in men's sports teams or groups of men. Taking it outside of that group seems obviously exclusionary to me.
This of Course has not the weight of a Research, but I really dont think this is a Problem for everyone who isnt a boy. If I would use Terms like that and someone would ask me directly, not do do it anymore, It wouldnt be a Problem for me in this specific case. Otherwise I see it as a unnecessary restriction of the way I speak.