Generous women are always considered to be the kind of big-headed silly woman, how did this illusion come about?

This illusion is mainly because they are very jealous in the face of anything, which also makes a lot of people feel that they are simply heartless, for their own marriages as well as treating their own husbands are very little attention, so they will behave so generously, but this may also have a more serious impact on them with each other.