This is banana republic type crap.
You have gotta believe that the Democrats are off their rockers. Their irrational hatred of all things conservative and GOP is out-of-control, especially as to Benton County That is a very rural area which was strong for Trump in 2016. Benton County is part of East St. Cloud, an area which tilts left due to being a residential area across the Mississippi River from St. Cloud State University. So, those precincts did go for Clinton, but not by a huge margin. Going further NE from East St. Cloud, you only need to get about 1/2 mile east along MN Highway 23 to reach Trump country.
The little diner/café/saloon patrons, where the incident happened, must be hostile to such behavior against a GOP candidate.