Who I'm sure actually is informed, but in this particular case is tweeting things that do honestly sound like one of the uninformed commentators pclmulqdq mentioned. I'm not sure why, since as tptacek said, blake3 is good and maybe even preferable on it's own merits without venturing into FUD territory. And if you still wanted to get into antiquated design arguments, picking on SHA256's use of a construction that allows length extension attacks seems like more fair game.
