The number of great women online is RARE. They are there, because they don't do the bar scene and their social circle or work hasn't or doesn't yield anyone, so they try going online. I dated an ex-beauty queen a couple of years ago that I met via online dating.
It's frustrating to you because you're not getting the results you'd like.
Don't expect people to send you a nice "no thanks" if they're not interested. Women send "no thanks" replies and then often get flamed back because the men are angry, bitter and frustrated and jerks that can't take rejection.
It's a numbers game, just like in real life. You're not going to get interest from most that you contact. The thing is, the whole physical attraction element which is primary is lacking, and you can't always tell from the photos, because I've met some, as I mentioned, who looked nice enough in their photos but were knockouts in person, and others that looked way cute in their photos but weren't in person.
So, when a woman "rejects" you online, it can't really count until you've met each other face to face. It's like when I met the beauty queen, and her first words to me were, "You really ARE cute!". See? They have to SEE you in real life before they can truly REJECT you.
And that's why you want to meet them as soon as possible.
You also have to realize that your first contact email may not exactly be the stuff that piques her interest. Most guys turn off women with what they write. What I wrote the beauty queen was simply something like, "I can tell from your photos that you're goofy."
Then when a woman gets an email that gets her interest, with a picture of a guy that looks good to her, that's when she usually checks out the profile, and if your profile doesn't interest her a bit further, and most again botch it up at that point, that's where she decides whether to write you back or not. Or maybe she sees that you're too far away, or not tall enough, or whatever. Don't send an email and hope, hope, hope she responds. Keep moving. It's a numbers game.
This one probably either forgot you had contacted her, but that I doubt, or now she's digging into her inbox because there hasn't been any emails from guys she'd rather hear from. That's my guess. So she winks, which is the online equivalent of a woman making eye contact with you in real life. It could mean you're just entertainment for now.
But that email you wrote back to her wasn't very endearing. You're supposed to flirt in return if you want to make some progress, not express your bitterness to women.
That whole "I would never be so rude" vent is your way of feeling better about yourself. But the problem is, the rest of the world is going to continue they way it has, so unless you learn how to not let it irritate you, you're in for a life time of getting irritated.