Catcalled Day 1

No catcalling really happened yesterday (11/18). I parked off-campus behind the McDonald's on Yale and walked to class. I did notice something on the way back to my car after class though. There was a group of mostly men, mostly Native American, sitting on the concrete wall as you walk in to the lot where i parked my car. I saw them from a distance, and immediately went in to fast-walking, head down, don't-bother-me walking mode, complete with getting my keys in my hand before I even entered the parking lot.
None of them stopped me, for panhandling or to buy jewelry or any of the other things I've been asked on the street in Albuquerque. But I still went through the motions to be ready in case one of the bothered me.
Why?