If I complain to a manager about a rude staff, will he beat me up?

There's this staff person at the food court place I like thats very rude. The place is tasty and cheap but he makes many comments like "dont use too much ketchup boy" in a rude manner. I have been afraid to go in the corner office to talk to the manager even though I see him sitting because the staff person is a big, strong, intimidating looking guy with some tattoos that I spotted under his uniform when I looked closely, so he may even be in a gang. I want to complain but I am scared, what do I do?