For someone very vocal and direct about one specific designer's work, there seems to be a very obvious lack of work, a portfolio or a link to a Dribbble profile on his own site.

As a designer myself, I'm always down for critiques and feedback (especially when it's a tough pill to swallow — this is what keeps me improving), but Michal, your post was overly critical and not constructive in any way. You mentioned your youth and ambition — being a designer is all about communication, whether in creating a product for your users, in pitching clients, in explaining functionality to an engineer, etc., and in my opinion, this is not the way to communicate with someone regarding their work, designer or not. Best of luck in learning this.

Edit: here's an example of someone doing something similar in the right way: http://kyrobeshay.com.