First of all, common sense time: if misandry were just a reaction to misogyny, in the US at least, it would have peaked just before 1920 (when women got the right to vote) and declined steadily since then, with minor upticks during the restrictive domesticity of the 1950s and during the Trump presidency (even though I maintain that the overturning of Roe v Wade was about conservative vs. liberal and religious vs. secular, not men vs. women).

However, Google ngrams show that this is not the case at all. I will post some examples in the automod comment as proof. They show that misandry is more prevalent than misogyny and that it has rarely followed real-life events considered to be misogynistic.

They show that misandry has been trending upward even before Trump, i.e., people just decided to start hating the most progressive and least sexist men in history for no reason.