Do atheists lack faith in the fellow man?
I think atheists have faith in science and what science would reveal about the fellow man and himself.
Are they bigoted, cynical, disgruntled and dissatisfied?
Yes, with the hypocrisy of theists.
Do they see all theists as inferior to them since they don't share their ideologies?
No, they see their fellow man as an equal to himself in nature. He might see religion itself as an inferior decision making process, worldview and mindset.