Fair enough, I didn't mean to be too nasty. He has a right to his opinions, even if I consider them by turns a menace to society (in the vax case) and not terribly enlightened (in the gay marriage case, considering I'm gay myself). And I obviously respect the guy tremendously for his life's work and contributions to the world, which are far more than my own.
I was just looking at it through a slightly different frame since he's a (relatively) public figure. It's one thing to tag your Facebook acquaintance in a post and have them respond, it's another to make an offhand, slightly pejorative reference to Beyoncé and then see that Beyoncé herself sent you an angry reply. It's certainly his right, but it's a bit unexpected, and I don't think 'summon' was a particularly bad word for it.
But I suppose this is a tech forum, and Eich is not Beyoncé, so it's a bit hazy.
This is extremely odious. HN is a public forum and everyone has the right to reply to your comments, especially if you mention them.