Who's choose should this be To choose If I can go the driver or the passenger ?

Hi guys what's your view on this I was asked yesterday to go to a music concert and my mate who is driving and he's already taking my mom and her bf and just now I was asked by my moms bf "you going to that music concert I'm going too" I said "well I was asked by me mate whose driving you there" he said "how can you sit in the car when there's 4 of us going" I said "he said I could sit in the back in the middle" he said "I don't fin think so I ain't been squashed all the way there and back" ???? I mean who he'll does he think he his my mates driving sure it's is choice if I can go or not he would not ask if there wasn't room in the car would he what's your view on this