Completely ridiculous and unprofessional.
But, not sexist. Just terrible.
I've met the opposite as well, charming, well dressed, and physically fit engineer types who can hold a conversation with the opposite sex without any awkward vibes at all.
The awkward types seem to lack some dating experience and thus cannot discern positive/negative social cues or read body language as well.
> The awkward types seem to lack some dating experience and thus cannot discern positive/negative social cues or read body language as well.
I hate replying to this, but here it goes: have you even given positive social cues to guys who weren't "charming, well dressed and physically fit engineer types"? Also, if you're only getting "awkward vibes" from unattractive guys, that might not be a problem with their social skills (at least not in the way you're putting it; charm is a social skill).
Not to mention, what does "well dressed and physically fit" even have to do with "awkward"?
And no, a man sexually harassing a woman isn't always sexist (even though I'd imagine that in the large majority of cases sexism plays a role).
Sexual harassment ≠ Sexism
What's important to discern is the reason behind the harassment. If a man is harassing a woman because he views his gender as superior to hers, or that she's nothing more than a sexual object, then that's a pretty clear-cut case of sexism. But if a man acts inappropriately towards someone because he lacks self control/tact, has poor social skills, etc. and is only targeting that person because he's attracted to them, then it's sexual harassment.