If you are approach by someone saying "Yo... gimmie some cash/ food, gimmie that"...
Step 1: Bring your energy UP! Give them positive energy and offer them some hope and $ and food, whatever it is.
Step 2: Wish them well, get the hell out of there
...
There's other approaches, but...
Very simple solution. doesn't always work, but generally does. This concept of confront or "turn your back on them", or fight... bad plan! Some of these people are VERY sick emotionally and will kill without hesitation. Don't know for sure what happened in this case but these young "gentlemen"...16 and younger, blew this 31 year old Chinese immigrant delivery driver to hell for 4 shots to the back... over chinese take out! You see any remorse?
https://patch.com/connecticut/bridgeport/suspect-arraigned-killing-delivery-driver-bridgeport-report
Another example... Car jacking performed by 16 year olds, feeding a chop shop with stolen cars. Brilliant business!
Most of America is very good, but we have problems with poorly raised humans and it's getting worse. This young Chinese man paid the price.
You can watch these videos all day to summize what culture is most risky to deal with so you can make your best decision. So much of making a decision... is looking at the individual, and assessing the risk... and thus action.
Another gem:
...
Failure to follow that process... good luck to you in USA society!