My moms boyfriend cursed at me

Long story short we were at a concert and he was talking about my aunts boyfriend getting hostile in his tone and was talking out loud and said I'm not gone let him ruin my day and I said it's sounds like u are and he told me to shut the fuck up twice and nobody was talking to me and I told him don't talk to me like that we had just got out a concert and people heard him and looked at us i was so embrassed and my mom told me stop that you being disrespectful and yes I'm 18 but am I wrong to fill like I shouldnt have been spoken to in that tone by any man ever because I almost punch his ass dead in his throat .