Dribbble haters are usually designers nobody knows and who rarely have major achievements to show for.

This is exactly, where I see the problem. You link all these things together, whereas you have no idea of weather they actually are linked. It is very important, that people start to learn and realise this:

The size of your following and the amount of attention you get, does not directly relate to the quality or quantity of work you do. For you to generate a following and attention, you have to first make the conscious decision, to show your work. So as long as I don't actively post something to dribbble, twitter, tumblr, my website or whatever channel, it will hardly generate any interest by itself. I may even be required to have my name not mentioned, because my contract says so. That means, that I will not have work to generate attention. Needless to say, that there are other ways of generating attention and building up a following then just pixels, but when you write articles and blogposts about the industry, you are still in a way showing your work, but thats debatable.

So now I have no attention on me, no following. Even though, I still work. My work may even be awarded with perks, such as an upgraded mac or something else. New clients and new projects come in, and I still do a lot of work. 4 years pass, projects were successfully wrapped and I still, have not decided to show, what I have done.

Does that mean, that I have no success, no achievement, just because other designers don't know me? Because I made the conscious decision, not to display my achievements, it means, that other designers will think of me as a person who's opinion is less valuable?

In short, yes, that is how it works for a lot of people. And of course that is total bullshit. I can be very successful on my own terms, have a lot of money and a secure job. But, the circumstances could be, that I will never be heard of. Unless you are a freelancer, your fame level will not have much impact on the projects you get to work on, so far at least.

This is what is poison in this community. The strong core belief, that only your level of visible success makes you a valid member of this community. And that is linked to the size of your following. Lot of twitter followers / dribbble followers = more successful. That's not true. I can have a lot of twitter followers and be a complete moron, as long as I know how to play the twitter game. I can have a lot of dribbble followers, without completing a single project.

In your statement, where you say, that dribbble haters are usually designers nobody knows, you directly link their level of fame with success. Just let that sink in for a moment.

Let's take that a notch further and talk about success and achievements. Because what you talk about, is external evaluation. When a group of people decide that something is good, it is good. The fact, that I meditate every day and write 3 A4 Pages every morning is of no relevance to you. For me, it makes all the difference and is a huge success in my life. Even the fact, that I am still alive, is a success to me, because I don't let external values define me.

So what you are saying with this sentence, is that people who to not subscribe to the idea of success getting defined by a group of people, are excluded from the right to criticize it.

Because I don't have a lot of dribbble followers or twitter followers, it means that I am not successful, which of course has to make me jealous of the people I criticize, which invalidates my opinion, right?

Maybe instead of trying to invalidate me, try to see if you can actually criticize what I said.