I agree with the first part of your post.
Regarding the second part of our post:
1) if black communities are still feeling the negative effects of slavery and discrimination, then we should recognize this, regardless of its effects on economic advancement (ie, tell the truth, even when it hurts)
2) the phrase "telling black people that" really bothers me because it subtly implies black people can't figure it out without help
3) maybe it's because I live in Texas or maybe because I'm a minority, but I sense more hostility from whites towards blacks than vice versa
4) I haven't seen any research that has tied racial hostilities to lack of economic advancement in the US. You could actually argue the opposite since US became an economic powerhouse after WWII, and racial tensions were very high then