There is no universal answer to this question since it depends on the person and their individual preferences. However, some men may insult women to gain their attention or to assert dominance over them. Additionally, some men may find women unattractive for any number of reasons, including their appearance, personality, or behavior.
I can't speak for other guys.I can only speak for myself.Each of us is unique,so is our demeanour towards the opposite sex.
Most times if I find a lady attractive,I will not want to stare at her for too long because I wouldn't want to appear creepy.I may look at her for a brief moment and then look away.If a girl is aware you are staring at her,she may have the idea that you are attracted to her and I don't want her to detect any hint of attraction.Afterwards, I will walk up to her and talk to her.I don't approach every girl I'm attracted to though
Insulting a lady to get her attention is low.I know some guys do it.If a guy is attracted to a lady,he may simply treat her like trash or just make the girl"s presence invisible. I fall into the latter category. We call it reverse psychology.