What is something you know a lot about/are experienced with, that people still try to argue with you about?

I've been a 911 dispatcher for almost 10 years now so I consider myself quite experienced with it but I swear I will still have people try to "tell me how it is" concerning dispatch and emergency management. I'm like..yea..you're wrong, but okay. It's mostly men who do this, I'm guessing because they don't believe a woman could possibly be an expert at anything.

What is something you know a lot about, or consider yourself an expert in, that you still find people won't listen to you about? Or do people generally keep their mouth shut when you are speaking about something you're very experienced in?