Expect more and more of this from the Democrats as we approach the 2020 election. Their only agenda is identity politics - call all the Republicans names - and over three years of accomplishing nothing whatsoever while in power in the House. They have had over three years to plan an election strategy, and come up with? - Name calling - which if they do it enough, causes idiots like these to take it to heart, and attept to hurt, maim or kill Trump and GOP supporters. And don't expect the local police to do much about it - their hands are tied by Democratic mayors of major cities in almost total decline for decades under their rule. Trump is a shoo-in for re-election in 2020, but it is imperitive that the GOP holds the Senate and takes back the House, or it will get worse and worse and worse.
This has been the pub template for decades. They set the table, they made the menu, and now they are dealing with the results. Pubs have been ugly and nasty for decades which has infected the culture. You reap what you sow.