>>115758131>commonly used by Antifa today
No it isn't, it's a really obscure symbol. Google "antifa logo" and the only image results you'll get of red triangles are from articles about Trump's tweet.
He's stirring shit. Purposely posting things that are clearly offensive but he can claim to be surprised about because of some flimsy link to his political opponents. He's willing to use Holocaust imagery in a "gotcha!" ploy at the libs.