It's hard to put it in words as our perception of aggression is a basic social instinct. But, broadly, you know from posturing (bucking up, moving in closer) ey

It's hard to put it in words as our perception of aggression is a basic social instinct. But, broadly, you know from posturing (bucking up, moving in closer) eye contact, tone (more volume, or possibly less) and the cursing would get personal, demeaning, etc.