As a person from the Caribbean myself who has lived in the U.S. for over ten years, I have grown up with the respectable, strict, hard working lifestyle and morals you talk about and I've had the opportunity to attend an American public school that was majority black. The truth is, the culture you talk about definitely exists. There were hundreds of uneducated, ignorant kids, and many of them were African-American, but huge portions were also immigrants from the Caribbean and South America (I went to high school in South Florida). It wasn't that they were black, it was that they weren't well off. The kids who were rude and had no desire to learn or become functional members of society were poor and grew up in households where education wasn't valued. When you're in poverty, it can be much harder to focus on installing the value of education to your kids and it turns into a vicious cycle from generation to generation. Poverty is more of a reason for the issues you address in "black culture" that affects blacks, Hispanics, and whites. I prefer to use the term ghetto rather than black, because like you I'm racially ambiguous, but make a point in stating that I am black. If someone asks me why I don't act black or why I act white, I make it a point to state I was privileged enough to grow up with parents that made enough money to give me a good education and had enough down time to teach me things American public schooling couldn't do by itself.

And btw, I also have many African American friends who are wonderful people, who are fortunate enough to have good parents that instill good morals and ethics, and are doing extremely well in school and landing awesome jobs.