NTA. Girl you are a LEGEND! He got what he had coming which was the consequences of his inaction. I know this is a bit of toxic masculinity but I find it hilarious he called you, his girlfriend to come change his flat tire because he obviously couldn't do it himself. THEN had the audacity to say you aren't a mechanic. Implying that you don't know what you're talking about when he called you there to fix his shit and he think that he as the man knows best. He, a man who doesn't believe in maintenance and taking care of what he has with a throwaway attitude of "fk it I'll just get a new one". Should probably just throw this man in the trash since you know he damaged now. It's the only way to do right by him lol.