Not on purpose.
I don't see what is really wrong or racist trying to bond with that line.
"Please vote to preserve the unique character of Warren…" - Robert Duvall

Yes. The movie wasn't that complicated at all.
It's a white supremacist cult that kidnaps black people in order to exploit the black person's perceived talents. I have no idea what special talent the black house worker was supposed to have. Being a clean freak?

Are you trolling?
Never lose your desire.

"Perhaps he was socially awkward around blacks because he was using their bodies and didn't care about getting to know them on any intellectual or deeper level."
Yes, probably so.

Do you think the dad just didn't care since he thought he was going to perform a brain transplant?
Like he figured why not pretend to care about the black race?
Perhaps he was socially awkward around blacks because he was using their bodies and didn't care about getting to know them on any intellectual or deeper level.
"Please vote to preserve the unique character of Warren…" - Robert Duvall

And that's paranoia.
I wouldn't want you around any white friends of mine. I don't really have any right now due to the entire stupid ****ing BLM George Floyd types getting murdered during a routine traffic ticket.
Once the BLM goes away, I'll be able to have white friends again without black people acting ****ing stupid about it.
You're not invited into my circle.

Politics weren't being discussed, so it just seemed try-harded and douchery.

That doesn't make sense to me.
We think dad is trying to bond or relate to him.
So how is that a wrong line to bond/relate with a black person?
"Please vote to preserve the unique character of Warren…" - Robert Duvall

You would know.

It's so non-racist, it's racist.

It's not racist. It's a comment people use to show acceptance and that's what they wanted to come off as.

It's considered racist, since he brought it up out of nowhere, for no apparent reason.

It was a sense of awe and jealousy felt about black people.
The film then had some thematically lofty, distorted and egotistical ambitions.
Norman! What did you put in my tea?

That cult wasn't even racist. It was a sense of awe and jealousy felt about black people. They wanted to become a black person. They were very selective too.