Mechanic
The average person will hear their car making a strange sound and probably won’t immediately know what is wrong. This is because cars are pretty complicated for both genders and we are not all mechanics. You know what, even mechanics need to pop the hood to properly understand what is going on.
Instead of creating an inviting sign with the list of his services, this mechanic decided to turn it into a sexist joke. He is under the impression that women and only women have no idea what is going on with their cars and need things to be explained to them as if they are toddlers.