You're not really mansplaining here, your defining a word that means something a little different across different cultures and had been demonized a lot.

Anyway, that's not mansplaining because even most feminists have trouble defining the ideology and movement at times once you get beyond the basics. It's hard to find an actual expert on feminism amongst all the noise and you didn't come off as claiming to be one to someone who actually is. Being a woman doesn't automatically make one an expert on feminism whether one claims to be a feminist or not.