People will think you're a bully if you harass others.
Roberto is at a house party with a lot of pretty girls, and a couple of other men.
Roberto wants to impress the girls.
Roberto befriends one of the other guys, and they take turns telling jokes to the girls.
Roberto starts calling out of the other guys shortcomings in front of the girls.
The girls like the jokes and eventually two of them invite Roberto and the other guy out on a double date.
The girls band together, call Roberto a bully, and force him to leave the party.