Not A True Atheist -- We mostly see this with Xtians, saying "you're not really atheist, you're just mad at god". It's a ploy to disavow anyone having no beliefs, therefore making a claim that everyone, whether they are willing to admit it or not, believes in a god. This supposedly supports their faith in some way.

But there are secular people as well with this same arrogance to make unfounded claims for others. I find this ridicules and asinine. I wonder if this is a indoctrinated habit leftover from religious judgment days? For some giving up their gods is easier than giving up their behaviors.