BlueWonder's post bears repeating:
I know someone who went with a group of 14-15 year olds on geography fieldwork. A boys group and a girls group in different streets but the same area/same activity -, measuring pavement widths. The girls group was given drinks of lemonade on a tray by a kindly resident. The boys group was reported to the police by neighbourhood watch.
Due to various health problems both my sons missed a lot of school. If I hadn't made a big effort they might have lost a lot of friends. So at weekends my house, which is in the middle of town, became boy central. During those early/mid teen years I often had as many as 8 boys sleeping over including my two The rules were simple but firm.
And they were lovely boys, now lovely young men. I still know them all. The few who didn't fit (drugs mostly) were excluded by the boys themselves because they couldn't keep my rules. A couple sorted themselves out, possibly partly as a result. One of them credits us.
Boys are much more open about their feelings than in my teens and I have been touched by the support they give each other. The ones I got to know were thoughtful and responsible. They could also be daft. But they were never criminal or nasty.
And yes, they told me how hurtful it could be when adults treated them as potential thugs - crossing the street or gazing at them with hostile or suspicious eyes. I did explain that women and girls had reason to fear groups of boys but as they pointed out that doesn't explain people looking at them like that in the middle of a crowded shopping street.