If an otherwise intelligent man fancies a woman, as well as doing all the textbook stuff to signal his desire for her, is it a bad sign that he goes out of his way to strut around her vicinity, chewing food like an open mouthed yob? I wouldn't try to impress a man like that!
That would be a right turn-off. I can't imagine the context when any bloke gets a chance to strut around near me chewing food, except at a barbecue. Where's this happening?!
You might find if a guy fancies a woman and there are other men around, he will try and put the others down in some way. This guy won't be intelligent though!
He could be oblivious about his open mouthed eating being bad manners. Which makes you wonder what other bad manners he might have. Or just an innocent slob.