While Linus went overboard (as he has a history of doing, and as has also caused negativity to the community), this post is still very well liked because it appears to be a strong example of someone calling out the BS that a lot of developers like to throw around. No one's going to join in a circle celebrating Linus picking on some first time contributor who didn't know any better, but that's how it sounds like you're interpreting the post.

To add some context, there's a toxic superiority complex that many developers have where they jump to blame others for issues that actually relate to their code. You can see this anywhere from developers who immediately blame users without investigating to software developers within companies who are quick to pass off issues as not their team's problem.

So, in this example Linus is actually calling one of these developers out, which is why the post is very well-received.