Lockjaw

Texas. Born and raised. My mom is from Alabama and spent much of my childhood in the summer time in Alabama,Georgia and Mississippi. Most of my mother's family still lives in the deep deep South. And I'm black and no offense but I think I MIGHT have bit better pulse on this than you do about what might offend regarding the usage of those terms.
And yes if you call a younger black person colored they are likely to take it with the same implied insulting nature as the other words you are familiar with. But if you don't believe me go ask some of your black classmates how do they feel about the word "colored" or better yet to get a full sampling go find a board populated mainly by black people register and ask them. I promise you more will agree with me.
Now this isn't imply that 100% of the black populace will have an issue with this. Older black people late late 50s and up likely won't blink at you using it as that's what they were called most of their lives. Blacks that grew to maturity(age 40-50) during the cultural and racial revolution in this country remember being called colored and might not call you on it but they will wonder why you are saying it doublely so if you are young.
I'd say well over 95% of black people under 35 with the percentage getting higher every 2-3 years you do down from that age will balk at you using the term colored. And the younger you get the more likely a borderline violent reaction will occur.
Just trying to educate folks because a lot of the times people say things that can be construed as racist when they honestly do not mean anything behind it. It's not being PC it's just being respectful.
And yes I know what Negroid is and how the term is used but believe me if you walk around calling black people Negroid they won't be too kind to the usage. Just as if you started calling Asian people Mongoloid.