A few things.What makes you think it’s racism at all? He’s got a funny name. Just like other examples in this very thread. Get offended by actually offensive things not just perceived ones. Intent is a real thing.
One: I don't think anyone has stated they are offended. Nick said he was tired of an awful joke, I and others agreed. I can't speak for anyone else but I'm not offended, and telling people what they should or shouldn't be offended by is a straw man at best since offence is an emotional reaction and not one you really have control over.
Two: Intent. It's lack of intent that makes this casual racism and not just racism. If someone's old Grandpa refers to all Asian people as chinks just because he grew up hearing that word and thinks that's what they're called, that doesn't make it not racist. The racism is baked into the society.
I don't know why you're getting very defensive over this dumb joke, but no one is saying you are racist for saying it. No one's trying to cancel grandpa Dave. No one is even saying you can't still make it, instead we're pointing out the reasons why maybe you shouldn't want to, and if you still insist after that then fine, maybe Netflix will give you a special about it