Not that it's illegal, but he shouldn't be surprised if people just dismiss him whatever message he's trying to send just because he seems insufferable.
I will say that you can write whatever the hell you want on the internet and the reach you'll get will probably be the free pass or not, it's not for you or me to decide.
He can say whatever he wants, people can upvote whatever they want, commenters can comment whatever they want. I'm just trying to justify a viewpoint you could be taking when interacting with this article...
Note that he says Linux and Apple fanboys. You can still like either while being realistic about their flaws and shortcommings.
Also, learn to take a joke.
Yes and no. Technically it's his blog and he can put whatever he wants if he doesn't want people to take him seriously. I'm not saying I agree with his language used but he probably wasn't expecting it to feature on news aggregaters and it's not like internet discussions comparing Apple and Linux are known for being devoid of arguments and heated knee-jerk comments; even without the initial flamebait.