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I can find and post hundreds of such illogicalities where users have commented on threads without even reading the OP, they read the title and write their response according to it and don't care what is written in the OP. The point is, what after that? We are only going to waste our time doing this because this isn't going to stop. We can't report such things to moderators because they are not completely off-topic, but the answers are just a bit illogical and don't completely match the OP or its context.
When you find someone who doesn't seem to have read what was written in the OP - then you can report it to the moderator. Your job is only to submit report and you can never decide whether it is worth deleting or ignoring. Regardless of what the moderator decides about the post you report - your job is only to report it.
We can only correct or call out as many as we can, or simply ignore them and move on because I don't see any clear solution for this problem.
Ignoring such users only solve your own problem - but you can find a solution if you report them to a moderator. If you intend to contribute - then take your share to report such posts and become to top reporter.