Black parents aren't the only ones that teach their kids this. I have no reason to fear the police yet I was taught the same thing. The "Yes sir" "no sir" I was taught as respecting authority. Police offiers were not the only ones I was taught to answer that way. I was also taught that cops have hard jobs and sometimes they make mistakes so I don't want to do anything that might make them nervious or think I have a weapon because they may make a mistake and shoot. That although that isn't ok that you should do your best to ensure mistakes don't happen too. In my case it wasn't hands up but hands in plane site (generally on the wheel as in a car has still been the only place I have ever been stopped by a cop.Also to address the "Hands up, don't shoot" thing. While most people understand that this isn't literal, and it did not actually happen in the Michael Brown case it remains an important narrative because this is how many minorities have to deal with the police and how they teach their children to deal with the police.
Put your hands in the air. Keep them visible at all times. Keep your head down as not to seem challenging or aggressive. Answer only "Yes, sir" or "No, sir." and if you are under age don't talk without a parent present.
The sad fact is when an 18 year old white man is interacting with the police and scratches his butt, it is because his butt itches. When an 18 year old minority man interacts with the police and scratches his butt he is, potentially, reaching for a weapon and deserves to be shot.
Also, just look at the title of this thread. The thought that black lives matter is "stupid" and "crap."
As for getting stopped for being black in a white neighborhood. My sister was once stopped for being white in a black neighborhood (work trip before GPS and she got a bit lost and ended up in a residental neighborhood. It is common knowledge in one place in my area you are 3 times more likely to be stopped if you have out of state plates espeically for speeding. I have been stopped on a miltary base for driving a mustang into a work area (I had authorization but only company cars are allowed in, rental cars count and I had been upgraded for free that trip). People make generalizations of what is common in an area all the time and things that are uncommon are going to get attention.
The idea that black lives matter isn't stupid and crap the idea that a group of people are claiming mistreatment yet segrating themselves is stupid and crap. A slogan like "All lives matter" gives the mesage that these people are just that people and they should matter just as much as anyone else.