the thing is, men are incentivized to talk like that because girls want it -- just on a topic that they truly don't understand. it only feels demeaning when they assume a prior level of knowledge that you actually have.
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Eh this is kinda true but the upside is often not the obvious one. My claim in the starting thread was that mansplaining is the result of a strategy that works well when both parties do it, poorly adapted, which is more than enough to guarantee memetic fitness.
Plus because of the way women tend to be socialised to placate men, probably a large proportion of women either let them get away with it or nod, smile, and leave without providing feedback, so there's relatively low selection against it that would let men learn.