People you know who have stubbornly mistaken views of games/genres based on 0 experience and refuse to change them.

Example: I have a friend who does not do well with horror games. He refuses to play any Doom game because he insists they are horror games. He based this opinion on....... (no idea really, he as never played one and only admitted to second hand accounts of other people online telling him about them) and refuses to entertain any explanation that, yes while it does have a vaguely horror-esque look (if you consider 80s metal album covers horror) it is all about being the thing horror monsters are afraid of. Best I can figure he saw some videos or the discourse surrounding Doom 3 back in the day when they were admittedly going for a horror feel and just generalized that to the whole series.