Well, you're quite right, but I disagree that it's a problem. Snark, sarcasm and underhanded jabs are absolutely valid rhetorical techniques; and, if you don't like them, there are plenty of good responses in kind, that will reflect on you far better than if simply tell on them to teacher.

In case you were having difficult guessing, I'm minded to agree with tptacek. (And not just because of my sibling comment, in which I admit that my home network is indistinguishable from that of a 90 year old technophobe who got his not-daft-but-still-technically-ignorant grandson to set it up for him.) Is the interviewee's home network, assuming they even have one, really relevant?

If they're going to be setting up a network for you, wouldn't you rather they had experience doing something significant on a professional basis, not just setting something up at home?

If they're going to be doing something else, what relevance does any of this have?