Guys whats the point of trying to pick up on a girl with a sleasy line, or honking at a girl while shes walkin

i honestly dont get the point of honkin at a girl in ur car..whats the point if nothings gonna happen after that point or whats the point of trying to flirt with a girl, stare at a girl for a longggggg time when u walk past her if ur not going to get her number or even tryin to even have a conversation with her....what do uuu get out of it?