Is saying "don't try to act like that nationality we're not stupid " racist?

I got into a huge argument with my parents and my dad said that. I said "that's a stupid opinion, you're so racist". He got mad and said it's not racist. Which it IS, because he's practically calling everyone else that's not my nationality stupid.
I think he might be an atheist also.
As you can see, by my grammar and punctuation / spelling.. I'm stupid, so Maybe I'm from a different nationality to him._.
I'm really pissed off. If you can tell.
yes , it is racist.
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no, it's not racist
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Is saying "don't try to act like that nationality we're not stupid " racist?
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