What is the ruling on saying "Don't say such-and-such a person's words" or "No need for Egyptians' talk"? Is this considered backbiting, belittling, or mockery?

Speaking about a specific person in a way they dislike is considered forbidden backbiting (gheeba). If it involves scorn and belittlement, then it is forbidden mockery and degradation. However, speaking about Egyptians or others in a general sense is not considered backbiting, but it may contain mockery that should be avoided.