You've misread the article. He isn't complaining about her not knowing the proxy setting. He's far from being arrogant - he's complaining about how people look

You've misread the article. He isn't complaining about her not knowing the proxy setting. He's far from being arrogant - he's complaining about how people look down their nose at 'support' while being clueless about the things they need support with. He's not complaining that she doesn't know that the proxy blocks streaming video, he's complaining that she doesn't know that her powerpoint presentation uses streaming video and what the ramifications of that are. Read the article again and this time actually look at what he's complaining about, not just the tech keywords in the story. His problem is with her demeanor, not her skill.