Calling everyone "you guys" is offensive; it suggests that being a dude is normal and everything else is deviations we can just ignore. I will believe that "dude" is gender-neutral when I can call the guys I work with "ladies" and have it be considered gender-neutral.
1) Yes, even if implicitly. It says "I expect people to conform to masculine norms; everyone else need not apply." Whether or not they specifically set out to exclude women, they did set out to exclude everyone who wasn't willing to tolerate their sexist and exclusionary behavior, who will statistically be more female than male (though plenty of men are excluded too.)
2) Yes it is. Plus, as men stated up stream, it is directly offensive to some men too, and it should be offensive to anyone who doesn't want to work in a field populated by sexist assholes.
1) Yes, even if implicitly. It says "I expect people to conform to masculine norms; everyone else need not apply." Whether or not they specifically set out to exclude women, they did set out to exclude everyone who wasn't willing to tolerate their sexist and exclusionary behavior, who will statistically be more female than male (though plenty of men are excluded too.)
2) Yes it is. Plus, as men stated up stream, it is directly offensive to some men too, and it should be offensive to anyone who doesn't want to work in a field populated by sexist assholes.