One thing the recent sexism discussion made clear to me: many people, when asked whether they witnessed sexism, talk about isolated sexist *remarks* they witnessed or didn't witness: catcalling, fuckability scoring, demeaning commentary about body weight.

But sexism is *structural*, and witnessing sexism also means witnessing mansplaining, almost exclusively male engineering classes or upper management ranks, gendered clothing and toys for toddlers, parenting advice for "moms", and much more.