SRS said, "Undergrads usually don't have the critical thinking skills established yet to construct the complex arguments needed for these conferences."

Huh???

Critical thinking skills may be in the process of developing in an individual at any age, regardless of their level of schooling.

If you don't agree with the list of "black expressions" or their origins, perhaps you should state which expressions you disagree with.

Personally, I think Azizi probably has a better take on this than you. As has been mentioned previously, it is how the expression is perceived (rather than the origin) that actually matters.