The manner in which an answer is worded matters because it says so right there in the guidelines:
“Responses must be respectful.”
I am not religious, and I have a rather thick skin, but I think most people would agree that “skip the whole fuckin thing” is not a respectful answer (and if one were inclined to apply all the guidelines, it should be modded because it is also not spelled correctly).
As @rangerr said, those are the rules, and they should be followed. Are they harsh? I would not say so. In fact, I think they are quite reasonable. Are they always evenly applied? No, and they cannot be, for the simple reason that moderators are human, and in any decision they make there will be an element of personal judgement. I, for one, think this has improved over time, but I am sure that those on the receiving end of a modding will not be all that happy about it. Such is life. You cannot please everybody all the time.
I agree with @13thpagoda that it does seem like every time someone complains about the rules, he or she will get a “well, if you don’t like it, you can quit and make your own site” response. Again, this is an area where I think things are much better than before (though that might be because that happens a lot more when there’s a migration from a site that goes down). Furthermore, the way this question was originally worded did not really invite to an honest debate about the rules, to say the least. Inflammatory questions will get people fired up.
Now, if the question is “why should answers be worded in a respectful manner?”, I would say that it is not too much to ask people to be polite to one another on an Internet forum. Yes, as @MissA said this is the real world and people should not be expecting kind, sweet words in every answer, but they also should not be subject to rudeness, no matter what. Some have said that this applies especially in the case of new users, because they would be more likely to quit after someone says something mean to them, but I think that we all deserve to be treated with respect. Is it really all that much to ask? Sure it is a nasty world out there, but this is a social site, where people come to get answers and socialize.
Do all questions deserve thoughtful answers? No. Some questions are downright dumb. Most will get modded, but some will survive (again, because there is an element of personal judgement in the modding process). Take the questions that ask about an illness or a potential pregnancy. If you ask me, all those questions should be immediately removed, and the people asking them should get a message advising them to go to a doctor. If, however, one of such questions makes the cut, would it be appropriate to say “You should just fucking go to a doctor, dude”? Wouldn’t it be more helpful to say “I understand you’re worried about your condition, but we have no way of telling you what you have. You should go to a doctor right away”?
Lastly (takes a deep breath), written communication has its limits. We cannot always tell when you are being sarcastic, or if you are saying something “tongue-in-cheek”.
Now, Social is a whole different thing. In Social y’all can go make me a sandwich. Easy on the lettuce.