No problem, Ultima Dude Bro.
But seriously, report that. The cops aren't gonna be like "OKAY HEY YOU TWO ********S... UM THIS ULTIMA GUY HAS BEEN SAYING THINGS ABOUT YOU TWO... SO UM... KEEP IT DOWN." They will keep everything confidential.
You just need to report it, give them a description of the dudes, let them know where they hang out, or get a number to call if you see them on the street. When you report it, they will do an investigation. Once they get everything together, they can be prosecuted. They could be put in jail for robbery, or if they even so much as laid a finger on you (literally), they can have assault tacked onto their laundry list.
Lastly, Weegee, you're not funny.