<human>: Summarize the given text in a few sentences.

Sorry for the formatting its my first post. My boyfriend and his friends have a group text that they chat on all day. Today I saw a screen shot of my best friend's tweet and a load of mean comments from his friends about her. I had seen this about a year ago and got really mad, but my boyfriend asked me not to say anything so that it wouldn't cause problems. I had totally forgotten about it until I saw the tweet today and he admitted that it is a pretty frequent thing. I was upset because I thought we all got along great and were way too mature for this kind of stuff. My boyfriend doesn't contribute to the posts about her but instead is a bystander, which I let him know still upsets me a lot. The kicker is one of his friends in the group text is also my cousin who initiates most of the rude comments and posts. I asked my boyfriend to confront his friends but he thinks it's not big enough of a deal to cause problems with his friends over because his friends are constantly making fun of people in this way. The reason I was so angry was because the comments were very hurtful and a lot of them mentioned hating her in which my boyfriend said none of them have any valid reason to.  I asked if he would mind if I texted my cousin and politely asked him to delete my friend off of social media if she bothers him. Do you think I'm overreacting? I don't feel right staying quiet about this issue but I'd like some other opinions! Thanks!
<bot>: Saw my boyfriend's groups texts with his friends making fun of my best friend. Wondering if I should confront them or if I'm overreacting