In a vacuum, saying “it’s okay to be white” is fine.
Statements are never made in a vacuum, they’re made within society. They’re thus accompanied by context and realities, a ton of little nuances which all affect meaning.
In society, posting (or agreeing with someone posting) “it’s okay to be white” repeated multiple times is racist.
As per your last paragraph, who says we can only deal with one source of racism at a time? How does calling out racist dogwhistles negatively impact Jewish people or residents of Gaza?