Suppose there is some future society that has decided that weird stinky dudes that make inappropriate remarks, stare at women's tits and compulsively hit on attractive women who are just trying to exist in a professional setting are actually A-OK. Why is that society's alleged values superior to our own?
If we are trending towards a direction that makes what we now regard as sexual harassment ok (again) then I would say we're going in the wrong way, and there's no more reason to regard that hypothetical futures' values as better than ours, any more than we regard the 1950s values better now.
This doesn't remotely analogize to "gay rights" or racial tolerance, etc. Being enraged/uncomfortable about, say, interracial marriage or consensual gay relationships was always a matter of people becoming involved in things that were none of their damn business (e.g. "I'm angry about what those gays are doing behind closed doors") or denying them to right to participate in society as equals. Not liking stuff like sexual harassment is something we do because of its effect on the person involved (e.g. "it's hard to be taken seriously as a professional and feel that I have dignity when Stallman makes remarks about my virginity and stares at my tits") or others like them.
IMO second guessing what you think (?) and say is hardly all that difficult. People could go a long way by (a) being kind and (b) acting (shock horror) professional in a professional context and not trying to use the workplace to get dates or get laid, and (c) shutting the hell up once in a while rather than treating us to their opinions about Every Goddamn Thing. Honestly, the sheer egomania of Stallman deciding the whole world needed to hear his thoughts on underage sex is pretty wild.