A Martyr complex is very common among the narcissistic, as are false claims of expertise. They often will launch into digressive attacks when challenged to prove their (completely imaginary) claims of expertise.
Which brings us back to the question- What games have they made?
Seeing as we are currently on a website for developing and distributing computer programmer that should be easy to do..... But wait, their own "creator profile" here shows zero programs they have worked on....
He wasn't mobbed. He made ignorant and insulting comments, repeatedly, and were called out on it, repeatedly.
The fact that everyone else in the thread pointed out they were way off base and being rude isn't "mobbing" them. It's just a natural byproduct of them making false claims.