“Seems like the mob knew him or knew of him - they called out his name. Insane the police arrested him”
The protest was organized on Facebook. Pete most likely posted something on Facebook that was twisted by local BLM activists. His post could have been All Lives Matter or something negative about BLM with a hashtag that got the activist’s attention.
In my area this is happening a place of business. The local Facebook BLM activists look for negative comments on by business owners on Facebook to target. If the person is not a business owner they will target their employer.
I guess they going to people’s homes if they do not own a business or can not find the person place of employment now.