Bro, it was everything. The accent, the caveman sounds, the disrespect...it even made a broadcast box of white men feel uncomfortable..
I'd probably feel uncomfortable too. I would always be very cautious before ribing someone publically or someone I wasn't sure would or wouldn't be ok with it.
Surely we can make fun of names though at times though (without the degrading accents or caveman sounds of course)?
For example:
Q: What do you call a Samoan sitting on the floor?
A: Fa'lofa'sofa?
A kiwi mate told me that once. Seems pretty inoculate on its own.
My own IRL surname is one that is often mocked, not racially, but possible worse, and kids were ruthless at school (like realy ruthless), but I never saw it as anything other than making fun (although it probably upset me a lot at he time).