If you get a comment and its obvious that the person didn't read your book do you still thank them?

So, I have a question from a fellow writer on a writing website I am on. (inkpop.com) This question could help others, though, if you have friends or family reading your book.
If you get a comment and its obvious that the person did not read anything about your book (not even the title) do you still say thank you?

I think people that don't have the time to read anything about your book truly don't deserve a thank-you. If they have a real reason for not being able to read it for you, then thank them for trying to. Basically, if they devote time to your novel, short story or even poem, they deserve a thank-you. If they don't bother to read anything, not even the title and summary, then they really shouldn't be thanked. They didn't do anything for you, did they?

If you were swapping with the person, as in reading something of theirs in return for non-inkies, then you're in a different situation. If you've already read their book, you should request a new critique. Explain why you want a new comment. If you haven't read their story yet, then don't. It's up to you if you'd like to message the person and explain, but you shouldn't do anything for them if they're trying to cheat you.