It is bad, but this is what happens to major open source projects. Especially when security is brought up.

I see a bunch of github issues where Alice comes up and tell the developers their code is insecure.

Of course code is art, so developer Bob takes it to heart and say something along the lines "what do you mean? Can you prove it? I don't think I agree, the code is nice like this".

And then Alice and others start becoming aggressive, Bob starts getting defensive. At the end nothing is probably fixed but Bob is now sour and will probably become someone like Linus.

What I'm saying is that Linus must probably have had, and still has, to respond to a bunch of "f*cking morons" (to quote his words) and he's developed a thin skin has well as a wearable douchitude as a result of that.