He told me off when he claimed (on IRC) that you couldn't easily write good hash maps in C, but you could in Zig, and I sent him a link to hash maps I had written in C. Then he proceeded to tell me to stop bothering him.
When I started taking apart his claim that Zig does not have function colors, he got mad. Part of that was my fault; I didn't use the best language. But he still refused to acknowledge my arguments until I made a very long, mostly objective blog post about it that went viral. [1]
Then, and only then, did he somewhat acknowledge that I was right.
[1]: https://gavinhoward.com/2022/04/i-believe-zig-has-function-c...