I don't think you've read the rules. You're not allowed to use the word in any way or form.No, it's not. it's not even "nigger".
https://www.urbandictionary.com/define.php?term=Nigga What
Checking his chat history and this pic, he was clearly joking.
Is it bad? eh, i won't say it's completely harmless, especially with some people's thin skin, but i still think it's not racism. It was just a friendly joke.