There are some bad analogies imo going on regarding "outsiders" claiming ownership from "insiders" of a culture.

First,

She's upset to the point of tears that white ppl are rapping and receiving awards.

Not a single one of them ever told her "Hip-hop is mine, back off, its not yours"

So the analogies of telling Italian ppl in their home to step out of the kitchen so you can show them how spaghetti is made is not what's going on here. What's going on is you decide to bottle your mom's "famous" pasta sauce, people LOVE it and then random 20-y/o italian chicks on Long Island start blaming you for stealing their creation.

She's pretty explicit in saying hip-hop should be racially exclusive. Which brings me to...

Second, people are conflating the elements of hip-hop with the entirety of the black experience. So speaking english poetry in rhythmical patterns is claiming ownership of the black experience. Scratching records is claiming ownership of the black experience. Graf, Breaking, etc. How is even this the case when the elements themselves were born in a multiracial context?