First, sticking some airlocks and a spaceship in a story originally written as contemporary fiction doesn't probably make for very good sci-fi, so I'm not surprised a lot of readers didn't care for it. If there was no elaboration on the world-building and setting, I'd get irritated too.
Second, I think the author of that blog article is being WAY too hard on people. I'm sure some people don't read SF&F because they look down on it (though I've never personally met anyone who said that), but lots of others just prefer to read other things. I don't think historical fiction or mysteries are inferior to my preferred genres, I just don't really care for them personally. We're all entitled to our reading preferences.
I really don't know where to begin with the rant about how people look down on 'geeks' and tell them to 'grow up' in that blog post. I have all kinds of geeky interests and have never in my whole entire life encountered such behavior. People either share my interests, nod and smile politely because they have no clue what I'm talking about, or ask if I can fix their computer, lol. Though I don't approach people with the tone that they're wrong for not liking what I like, which may help.
Now, if you want to see some vicious genre prejudice, try writing romance. I have to correct someone going off on a rant about how stupid/inferior/bad romance is either online or IRL on practically a weekly basis, and I don't even write romance or bring the subject up.