@Bijou I agree most people expect women to shave their armpits. Armpit hair on women is something many people find at least moderately unappealing up to just downright gross.
They don't mind armpit hair on men quite as much.
They are entitled to their opinions.
Women are also entitled to ignore that opinion, and not shave. Men are entitled to ignore their opinion and shave.
Opinions on grooming between the sexes are not about applying standards on one sex or another. People see men and women different, and don't think a single unisex standard is necessary.