In my experience, criticism sounds the least constructive when you're not expecting to hear criticism at all.
The only reason to try to explain away flaws that other members point out is to try to save face. You're suggesting that you're better at what you do than what you're presenting to us, and then you get upset when no one takes you at your word.
I've been guilty of the same thing, but I've learned a thing or two that have helped me a lot.
First, before I post a photo, I try to imagine what I would say to someone else if they had posted the same photo and asked for critique. It's amazing how many times this has stopped me from posting a photo altogether because I realize it's not as good as I originally thought (my recent forum activity has slacked off quite a bit as a result).
Second, I try to ask for specific critiques rather than general critiques. In other words, if I had posted these photos, I might have said, "I know these are a little out of focus, but I'd really like some feedback on lighting and composition," or something to that effect. If you're not specific, then you should be prepared for any and every possible flaw in your shots to come up.
Third, if someone points something out that I didn't notice, I try to learn from that. Even if you think that the comment wasn't worded "constructively" enough for you, any criticism can be taken constructively if you're open to it. As a matter of fact, if someone sees something in your photo that you didn't, then it should be a clue that that's an area you need to work on.
You joined this forum for one of two reasons: either you think you're a stud behind the camera and you want everyone to see how awesome you are (in which case, you will be sadly disappointed by the lack of praise), or you're trying to learn and you want help from people that might have something to offer. If it's the latter, and you really want to learn, then swallow your pride and don't get defensive when someone suggests that your photos are sub-par, because that's the only way you'll know what you need to work on.