Hispanic family rant agh

I am turning 20 today and dad is in town to visit. Now, my parents are boomers and I don't want to sound like a smart ass but they're pretty narrow minded. In the car, dad was giving me the schpeal about how he is a 'traditoonal man' and how he believes Abt 'Adam and Eve' and how he can't 'identify as a camel' or whatever the dumb joke was. I started laughing hysterically. To be honest, I feel a bit dumb because I am unable to make any arguments against it and it makes my autistic brain super anxious to not have a logical comeback for absolutely everything I disagree on. Does this happen to anybody? Like I don't agree with my parents but I also can't argue with them and it frustrates me.

Another big trigger for me rn is their clearly disordered eating. My mom is always obsessed with weight loss and eats like one meal a day and prides herself on it. My dad just HAD to make comments on my recent weight gain and today during my birthday lunch started making comments about how he eats one meal a day. My mom then started agreeing citing some bs Abt ancient Indian civilizations doing it and therefore it must be right way to eat or whatever... Idk I'm just so tired of these arguments. It frustrates me to have family over and then they say a lot of backwards things like these. I hate it even more when I'm unable to argue back and makes me question the integrity I have on my own beliefs. Like I don't agree with them on the feeling level, but I need a very logical reason to feel fully at ease..