This study found that in the US, food allergies are actually more prevalent among African-American and Hispanic children than among (non-Hispanic) white children:

https://www.jaci-inpractice.org/article/S2213-2198(16)30504-...

What would make you believe that?

And do you still believe it after the other user linked an article about allergies in other races?

While that's a ridiculous belief, it isn't a racist belief.

It’s racism in the most direct sense. Suggesting one race in the case white people are inherently worse than all other races.

It’s not discriminatory, but racism is a belief not always an action. https://en.m.wikipedia.org/wiki/Racism

In fact - it isn't racism, according to the link you have provided.

"Racism is the belief in the superiority of one race over another."

Superiority is a key word here. The link actually ends up on the page for supremacism:

"Supremacism is an ideology which holds that a certain class of people is superior to others, and that they should dominate, control, and subjugate others, or are entitled to do so."