Oh no wonder you felt angry, I’m glad your aunt apologised as it sounded like she was trying to guilt trip you about the religion/family origin and it definitely says more about where she is than you IMO.

I also agree that you shouldn’t feel bad about sharing your authentic self on Facebook, I’d say your authentic self is something you can choose who and where you share with. Facebook is like an echo chamber IMO, so your friend was unlikely to really want to hear others opinions, he very likely just wanted to air his own. I do think your own thoughts on affordable cars are very valid as an aside.

Anyhow I’m glad you feel better about this!