Mansplaining
Mansplaining is a term used to describe when a man explains something in a way that is seen as condescending or belittling. It’s especially common for men to do this with topics they have little knowledge about in front of female experts.
It’s not just a waste of time for everyone to try and explain things to people who already understand what they’re talking about. You may weaken them by implying that you don’t trust their ability or knowledge, regardless of your reasons for doing so. You can put yourself in a position of vulnerability by appearing to have an overblown ego about your own expertise.