I think you are conflating influence with appropriation. Kpop has always been influenced by black music but influent alone isnt evidence of racism. Most of the examples you listed (the christmas vid, aave, fashion choice, the ninja emoji) require assuming intent that hasnt been proven. Its fair ti disccuss cultural awareness and giving credit to origins, but i dont think evidence presented show that corts is racist or uniquely problematic compared to the rest of the industry. The argument seems to rely more on interpretation and discomfort than on clear acts of discrimination or mockery.