How can gender-role stereotypes be harmful? Can they ever be helpful?

Stereotypes such as women belong in the kitchen can be offensive to women due to the disrespect. Personally, I feel like gender-role stereotypes aren't helpful. Everyone has rights and are able to do the same type of work. Another, expecting a male to be "manly" and "strong". They shouldn't be expected to do all the dirty work either. It's a biased question so this is just my opinion.

the telephone is the answer