Are you really saying only black people roast each other in "sessions"?
I think any highschooler will tell you that's wrong and I went to a school with a decent amount of white people (and have many white friends) so I know that the same insults black friends would hurl at each other they were doing as well and so were many other groups.
That's just a people thing.
I see what you're saying with the other point but that's just a trait of ignorant people in general or just people from lower income communities imo.
Not necessarily an exclusive quality.
Nah I'm not saying that black people exclusively roast each other. But if we are being honest, you don't see white adults, Asian adults, and Mexican adults "clowning" each other like you do black adults. It gets passed on to the kids more in our culture. As far as the kids go, Hip Hop/ being black/ is cool. I can almost bet (just because I went to a similar demographic high school
) that the "other race" kids in these sessions listened to rap/hip hop, wore Nike and jerseys, played sports, etc. and they were making fun of each other for the same things that we make fun of each other. White kids in a roast session is more fitting in with the cool kids (athletes - black kids) than it is "snapping" like it is for us which we usually learn at a young age from our peers/family.To get to OP's point, things that are seen as "good" are up for debate as to whether or not they make you "nerdy". OP is asking the question "what is nerdy" which proves my point about our culture. We have to worry about what is nerdy as adults. Some other cultures embrace the things that our young adults question because we are worried more about "fitting in" than "being exceptional". It's sad and I am not saying that any other culture is better than ours
but "making fun of things" is so engrained in our culture that we constantly question ourselves.

or Robb Parker calling RG3 a "cornball brother". There are connotations that we are supposed to be "cool" and being educated/ well to do is somewhat shameful to large pockets of Blacks. I don't personally hold any of these feelings since I'm educated etc. but I am more speaking as a general consensus. If you tell me that there is a cross culture of Asians as large as Blacks where being studious and not getting into trouble is something to be ashamed about/ corny, I would definitely disagree
my point was mostly that we worry about "being nerdy" for being "well to do" and not "being street". Also, I wasn't saying that this is the case all the time, but that we have by far one of (if not the) largest group of people who are critical toward someone who is doing right. Don't believe me, watch the Chappelle show "Calvin's Got a Job" sketch and tell me the laughs and situations don't ring true.
