Here is what you do if they bother you just get right up next to them and start a conversation get as close as possible. If you have ever had a person who isnt a close friend or family do that to you then you can notice how uncomfortable it can be.
Ok Im pretty sure they wouldnt last in america no offense or anything but where I live if someone comes out threatning he will have about 8 different people stand up and confront him. So how about you do this send them all on a plane ride telling them free rap songs and nike will await them when they land. Lol Nah seriously though just stand up to them tell them to back the F*** off and make sure your friends are bigger than you then you will dominate.