I've been stopped on street on a few occassions, yes, while minding my own business. Now, I can just about handle being stopped, I'm a young, I'm male, I'm of colour and I'm usually rocking a shaven head. Whilst I don't think I look like I scream gang member, I can see where the police are coming from - We have a problem with stabbings in the local area, better safe than sorry and all that jazz.
Now, Treat them with respect, they'll treat you with some respect and they'll let you be on your way sooner or later. Erm, No.
Without an expection I've been treated like absoulte dirt throughout the entire process time in, time out. From being stopped, to being searched, to being condsended to, to being eventually be let on my way. Guilty until proven innocent, every single time. When this happens maybe once every 3-6 months for the past couple of years you start to get the hump after a while.