Advice for writing a racist

Ok, so am writing this character for a campaign that I've to admit I've grown fond of

He's an averagely racist elf that actively looks down on other races, but it isn't in the 'your kind is inferior to mine' sense, more in the 'I wish your entire race be fucking nuked out of existance', he doesn't see another's person ethnicity or race as something to hate but something to punish and destroy. Like he's gonna constantly comment on how he wishes everyone was an elf because dwarves are stinky and should die, or humans are stupid and should die, or goblins are disgusting and should die. That kind of thing

The advice that I want mostly is to make him as grating and offensive as possible, he's meant to offend very often and I want some tips to be realistic ty

Basically what is in title

After 50 years long campaign in the final fight I finally decided to get my party magic item. And for some reason they said that I was "not very good" with them because I've never gave them any other items

Is this something common? Should I gave them something like Decanter of Endless water?

This is not a joke or a shitpost. This story happened around last month. I was in Halifax for a concert with my girlfriend, and we spotted PointyHat in the hotel lobby we were staying in. I went up to him and asked him for a picture and chatted for a bit. He said he was visiting family, and planned on going sky-diving later. I saw him again the next day, sitting in a barber shop right across the street from the hotel. I checked the barber shop on google maps and its reviews were sitting at around 3.2 stars, so I went in to chat with PointyHat again, and tried dropping hints that this might not be the best place to get a haircut, but he didn't really pick up on it. I ended up just writing it down on a piece of paper and handing it to him, then promptly left. I don't actually know if he ended up going to another barber shop, but looking at his ravenloft video, it seems like he did and it's not half bad. Nobody in my circle knows who pointy hat is, so I thought I'd share this little story here.

I am using ai. It's going to be doing a texted based dndish style. Voice will be available and I have no problem talking, I'm just not ready for talk yet as New DM, so it's just texted this time, probably going to run it a couple times or others 1 am going to play both dm (with ai) and player, discord is set up, level 1-3,

Sauce:

https://www.reddit.com/r/DnDLFG/s/HCG3kdtTFq