I don't think it's so much 'anti antifa sentiment' as it is 'explicitly playing our favorite colorful comic characters as a metaphor for current social movements instead of just their natural conflicts is a little on the nose'. People want to play characters and stories, not allegories; as far as I know. Plus it's awkward. 'Intergang are the Republicans'. It's like... no, they're Intergang. You can pretend ANYONE you punch is a Republican, but that doesn't make it so.
Plus I think this might be the guy who came onto a game recently and wanted to app repurpose an obscure character as a government agent whose job is to hunt down and murder members of the Irish center-left party, so, y'know.
If you want to make a 'beat up your political enemies' game, maybe don't use superhero characters for it. Just make an OC setting.