What? The only Plan 9 people that were on the Go team I know of are Thompson, Pike and Russ. I'm pretty sure that neither Thompson nor Pike know what 4chan is. Russ, being the younger one, probably has heard of it, but I doubt that he ever used it. I've never heard them make sexist jokes. On the contrary, I have heard Pike and rsc speak out for diversity in software engineering and social justice quite often.