MassResistance has been named a hate group by the Southern Poverty Law Center. They have particularly targeted trans people in MA and other states in New England. It's hard to tell from the pics, but the person being grabbed looks like a 'known' community member.
Rude signs (imo) don't work very well, though, especially in protests where the theocrats believe they are being persecuted "for the Kingdom," to quote the Sermon on the Mount. But locally-ish, I haven't heard anything off-base about the coverage of the choke-grab, even from mainstream media. The sequence of those events is undisputed.