@HeyDemonsItsYaGirl
I don't want to give my real job title but let's say I'm Head of Hedgehogs. I chaired a meeting about a hedgehog. A man who works in the Salmon department began by telling me that a hedgehog is a mammal, with the air of somebody magnanimously imparting great wisdom.
Oh god you've just reminded me.
I was a Director of (say) Badgers. Very well known in the badger industry and spoke at conferences, chaired the Badger Association etc. I knew my badger shit and was possibly one of the best known women in my (very niche).
I was in the market for a complex bit of technology which in a previous job I had run a project to build from scratch and was doing a beauty parade of suppliers.
In the meetings were various male directors and heads of dept - who all reported to me. I was the decision maker.
One sales guy not only directed his entire pitch to the men, when he did design to include me he did so to explain why the business model of my business was a good one. As if to a child.
Like he was bestowing some great gift, along the lines of "shannith, you see, the reason why badgers are so important are....lists some absolute basic facts about badgers.
My team knew me well and I could see them exchanging gleeful looks, willing me to rip him apart.
Meh. I raise your mansplaining with my magnificent passive aggressiveness.
I listened with arched eyebrows for a looong time until he mansplained himself to standstill before standing up and saying something along the lines of, thank you, that has saved us a lot of time.
He got all excited so I said something along the lines of because I only work with suppliers where there is a good cultural fit and it's very clear that your company is not it.
Thanked him for his time, asked one of the men to finish up the meeting and left.
There was great disappointment from my team - they all thought I would (verbally) lamp him.
I was tempted but it was almost beyond parador and not worth the effort.