Hi Serpens! I will be doing a demonstration soon, the problem is that we have 3 am at night over here and I am a bit tired.
But what I can say at least is, that such unprofessional people should never ever be part of a development team involved in a multi-billion-dollar-project.
This guy sounds like "if you say anything bad about bitcoin, i will give you a bad rating, mimimimi". I am sorry, but this is unprofessional.

I am really thinking about offering a donation of 50 BTC to the bitcoin foundation if they kick this guy out.