This is what you get when everyone gets a fancy shiny ribbon for participating. Everything is racist especially with the USA current President. Cockroaches are a bunch of bugs that swarm and zerg. If you take those comments as inflammatory, racist, whatever you will spin anything to fit your myopic view of the world.
I have never heard of Canadians or Mexican "immigrants" roaches.
The term roach coach is coined not from the race of the proprietor but of the generally uncleanliness of said mobile food dispensary and the propensity to have a large population of said roaches.