Is smiling about sex?

I didn’t know that acknowledging someone didn’t smile is sexist.  I really didn’t.  But then, I’m often surprised to find out how many words and phrases are sexist, racist, bigoted, homophobic, anti-transgender, Islamaphobic, and on and on.  Not that the press is making something out of nothing for political expediency.  I’m sure the media would never do that.  But it does make me wonder about the ease with which all criticisms and resistance to policy proposals during a Hillary White House will be dubbed sexist.  Nah.  I’m sure there’s nothing to worry about.