If you were raised in an urban hellhole all your life, I can see it being difficult to know how to act. But a lot of blacks seem to show the same behavior patterns in suburban areas or wherever else they are.

Also, it just comes down to the sheer number of incidents. For example, if I tried to recall the last 50 times I saw someone being very loud and obnoxious in public and half the time it was blacks, half the time it was whites, it might trigger me to think about how my group biases could be affecting my perceptions. In reality, blacks are acting badly a clear majority of the time and with only a small share of the overall population. It's not even close. For me to get it that wrong is like telling me I'm suffering from outright delusions rather than simply being "biased". I'm not saying you're doing it on purpose, but it has the effect of a sort of racial gaslighting.

I know this is a big ask, but read these accounts. Tell me this doesn't describe blacks spot on. There's a certain power to hearing someone's observations and seeing how closely they link up with your own observations. Some of which you never even consciously noted.

The Wages of Idealism, Urban Law 101

Also, not to give you homework, but google "why are black people so loud". It seems there's a lot of people with this same observation.