It is an awful question. It assumes bad faith on the part of the commenter. It's extraordinarily rude.

I'm not sure I would've interpreted it that way were I in your position, but fair enough.

Responding like this is preferable to calling someone else a tool.

I'm glad you approve. No, wait, I don't give a shit.

HN has too much tolerance for this 1000% totally bogus intellectually insulting rhetorical tactic. It demeans everyone.

The people writing these idiotic "you must be a shill for {Microsoft,Mozilla,NSA}" comments think they're clever, but what they're really saying is "not only do I not understand what the Fundamental Attribution Error is, but I can't even comprehend the idea of someone disagreeing with me or even presenting a fact or idea that challenges my preconceptions; no, it's much more likely that this is a bad faith comment than that I don't know everything there is to know about every topic".

And then other people cheer them on!

There is no online community anywhere on the Internet less capable of spotting a shill than Hacker News. Any competent shill could immediately see how to game the site.