Falling Love?

Today my friend(In this case called J because its confidential) and I saw a boy, S, sat beside a girl in library which the girl is my another friend, H's belover but H likes her with secretly.

After this ,J And I went to H's room and told him about this. We used dysphemism language when we talking about S. This is often for us to use dysphemism when we talk about others bad thing such as "Fat slob"(because the guy S is fat), " Insane ", " Love robber " and etc.

After that , J and I went for the concert in the same night. With the feeling of affinity, the girl sat behind me again! But unfortunately, the sit beside her is S again! And when I talking to her, he liked to disturbed us.

After the concert finished and also the "dinner" , J and I go to H's room again and "complained" about his "love rival", but at this time , his room got another roommate, and I get the suggestion from his roommate. At first , the roommate impervious of this issue but once I said this" Now everyone of us think like this , why don't you think the same way with us too? Come, don't you think S has round face with awkward hair?"

Because of I used the Ad populum appeal to commom belief, the roommate starting to "join" our group saying the bad things of S. This is a quite influencing fallacy to persuade the others because when everyone of you think the way opposite of you, you will seem like an alien and thus either your mind changed or them.This is considered as "Bandwagon Argument" too and I had push the "peer pressure" on the roommate in order for him to think on the "way" we thinking too.