Van is an awful human being
Van is a spoiled rich kid who we are supposed to feel sorry for when he has to pay for one semester of college after having 6 years paid for him. He then has to suffer by not paying his assistant (who then basically becomes a slave who loses his culture), and he has to get a job planning parties for other rich kids.
He goes after a girl who already has a boyfriend who is serious about marrying her, even though Van could have gotten any other girl on campus. The girl then poisons the former boyfriend with laxatives, likely preventing him from getting into medical school where he would have become a doctor and helped save sick peoples' lives.
He causes a panic by pulling a fire alarm, which could have ruin peoples' laptops because of the sprinklers, and would have distracted the fire department and potentially stopped them from helping out at an actual emergency. He also disrupted peoples' classes, where they were actually trying to learn so they could get jobs and contribute to society.
And, most seriously, he doesn't neuter his pet, and is therefore contributing to the serious issue of pet overpopulation that causes lots of pets to be put down every year.
Also, he is played by Ryan Reynolds, who is just a jerk.