The problem I have with “mansplaining” is that even if the behavior it describes is more common in men, it linguistically implies it is a behavior intrinsic to men, and not to women.
Clearly that’s absurd. Assuming someone else lacks knowledge of a topic for arbitrary reasons and in spite of evidence to the contrary is in no way limited to one sex or the other - nor even to one motivation or another.
A misogynist has no more monopoly on this behavior than anyone else. A racial supremacist can discount a person’s intelligence and education merely on the basis of their race. A religious zealot can do the same merely on the basis of difference of faith and doctrine. A political extremist can falsely convince themselves of the ignorance of others merely on the basis of party affiliation.
The key aspect of the behavior - the discounting of a person’s intelligence, knowledge, and education - is not solely the product of misogyny. It can just as easily by the product any variety of intolerance you care to name.
It can even be the product of mere absentmindedness and thoughtlessness. Despite having someone introduced to you as a biologist, that particular fact might escape you and after a bit of conversation you might find yourself explaining something to with biology to them as if they were a layperson with no knowledge whatsoever. It doesn’t have to be grounded in malice or intolerance at all - it can simply be accidental. We even have terms for this sort of thing, like “preaching to the choir”.