I think I've finally figured this out.
Any Republican who criticizes Trump, even if just by quoting his own words back at him, is a RINO, a globalist tool of George Soros, and isn't deserving of support by GOP voters. Either in the primary or otherwise.
But Trump going after other Republicans, even ones who aren't candidates, is just him playing smart, strategic politics.
Oh, and any large, wealthy donors who supported Trump in 2016 and 2020, but who now support somebody else, are also RINO's, and globalist tools of George Soros.