Technically it is a girl's bike though I'm not sure why.
Men's bikes have a straight crossbar and women's bikes have an angled or curved crossbar.
I have no idea why this is but it seems to not make much sense. The angled crossbar is overall a better design simply because if you hit something and slide forward off the seat, the chances of crushing your crotch on the crossbar seems much less likely on a women's bike.
But yeah, it's a silly thing to be made fun of.