Isn't it a joke? Not a very funny one, I have to say, but a joke. Person A posts something to LW that doesn't seem to have much relevance to LW. So person B replies with something comically-stereotypically LW that doesn't have much relevance to what A posted. There's a certain symmetry about it, and its irrelevance is also a way of saying "this doesn't belong here and so shouldn't be taken seriously". So I guess it's both a joke and a criticism.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.