I want to go on a date

Im 18 and I got asked out on a coffee date by a 21 year old I met on a dating app. I have a strict parent so I always have to ask for permission if I want to go out. She asked who he was and how i met him but I lied and said I met him when I went shopping and that he is 19. Anyway she got mad that I'd be going out with someone I don't know even though the coffee place is a 2min drive away. She said "whatever you're 18 do whatever you want but if something happens to you then that's on you" but I take it she was being sarcastic... so should I ask again if I can go or should I just leave it alone and try my luck with someone else another time?

I just need advice.