I've had worse. One user asked a yes/no question. I answered "no". My post was deleted. I cried for a couple of days but I got over it. I think. Still getting misty-eyed when I think about it. It took me a 2, maybe even 3 seconds to craft that totally-on-topic and very useful response. The forum is now so much worse without that valuable contribution.
I think if a person (most probably a newbie would do such a thing) repeatedly posts one liners like Great, OK, Yes , No should be deleted but if anyone rarely do such post then these should not be treated as spam.
As for your example, instead of writing only No if you have written as "No, I don't agree with you and my answer for your question is No. So you can consider my response on your view point as No" . This will make it a constructive post
I think you're falling for the OP's fallacy that only word count matters. If you just add fluff like your example - it would still be a low value post. It might be less likely to be reported or otherwise noticed by mods, and that's how many spammers are able to skate by, but that doesn't make it right. Adding substance to the post, i.e. explaining why the answer is "no", or why someone/something is "great", in a manner that is useful to other users - that might make it better. But the real solution is to not make such posts.
The other part of that fallacy is that "thanks" or "great" or whatever makes someone polite, and lack of such one-word replies makes someone rude... no, it doesn't. There is no such expectation here. Unfortunately this texting/chatting nonsense is infiltrating everything - from business e-mails to discussion forums and it will inevitably kill this site too. But until then why don't we stop looking at those deleted posts as some sort of crime and take it as a learning opportunity.