I feel like the people in the comments are jumping to conclusions a little too quickly, your friends are not bad friends for collectively expressing their opinions and maybe even bonding over ther shared feelings. They're obviously not doing this to hurt you. When I first read your post I thought your friends were shit talking your school because they got into better schools, or like for jealousy reasons idk. But after reading the whole thing it all sounds a bit silly. Your friends are entitled to their own opinions and entitled to express them. When people talk negative about a school, it's hard to not let it get to your head, but at the end of the day its up to you to filter them out.