While countries of majority non-white race are not pressured to accept others?

I don't think it's true, non white majority countries are also pressured to accept whites and other minorities, I.e. China, Africa

Sis I'm pretty sure most people also expect non-white countries to treat minorities well

What's the problem with accepting non-white people though? And who's being pressured?

because its their god given civil right to do what they want

In b4 the mess.

USA, Canada, Australia, and several western European countries are known for their generosity in welcoming all people. For a long time (some decades at least) it's been how they present themselves. So any change all of sudden is perceived as discriminatory, like "why change now," even though they may have valid reasons for cutting down on it.

What do you mean by "accept"?

Because one of the general principles of human migration is that people tend to move to where they can have more resources, opportunity, and safety.

Most of these "white" countries (US, W. Europe, Australia, etc.) tend to be more developed.

And no, before anyone asks, the reason why these "white" countries are better off has nothing to do with racial or biological superiority or any of that.