You are right that any term can be destroyed by the alt-right, that's totally true (I mean they got the term "walkable city" to mean something like "apocalyptic ghetto" in their sphere), but I think that "mansplaining" (and to a slightly lesser degree "toxic masculinity") were already dead on arrival.

Mansplaining is such a bad term, that it already doesn't work without the alt-right touching it.

At least in German speaking counties (can't speak for the rest of the world), feminism is known for being really particular with words used for/against women, because they know that words shape understanding. For the last 20 or so years we have had (and still have) a quite heated discussion about gender-correct language¹. But instead of applying the same scrutiny to terms used for men, these terms are just adopted without question.

I just want the same scrutiny to be applied for all terms. "Hysteria" is rightfully a word that dropped out of use, and so should "mansplaining" be.

Why not just use a gender-neutral word like "overexplaining" or just describe what's the problem instead of using a fighting term that only causes pushback instead of actually helping people understand problematic behaviour?

¹ German is a gendered language, meaning almost every term has distinct male and female versions, and gender-correct language means that you use constructs that mention both genders. The reasoning is that using the generic masculinum (aka, use the male version if you don't care about the gender) leads to people not considering women, so e.g. when you hear "Arzt" ( (male) doctor) it makes women working in that job invisible and shapes who wants to become a doctor. Similar with female-first terms like "Schwester" (which means "nurse" or "sister").