The image is of a plastic masturbating monkey, probably in reference to Linus Torvalds. They call him "Loudmouth Linus" because he reportedly called them names, and reference the recent WaPo article.
Look, honestly? What BSDs are doing is great for those who want to take advantage of it. The mitigations they are adding will probably eventually be merged into the Linux kernel. And if not, unless users stop using Linux, Linux will exist without them.
And thus, I think this is an immature reaction to having a pull request refused. This is many things, beginning with "not nice."
The BSDs have their own stuff, the Linux users have theirs. Dunno what the hubbub is about.