I remember me and a friend(same age as me) went to a concert with my brother and his friend(same age as him). We offered them drinks and things, and they declin

I remember me and a friend(same age as me) went to a concert with my brother and his friend(same age as him). We offered them drinks and things, and they declined. After the concert, I was in a state of paranoia and my friend was puking in the toilet. My brother and his friend were just sitting quietly in a separate room, chilling, watching netflix on their own computers. It was odd.