... people who think they have the right to decide what's "best" for someone else's kids ...
someone can't control the urge to correct someone else's spelling.
People who have an exaggerated sense of entitlement - as above, or "your gear isn't as good as mine", or "you ought to tie your reg snap on with cave line, not zip ties" or, when not a member of the dive op staff, "you can't dive by yourself!" . . .
Precise words rarely have precise meanings ... it's almost always contextual, and often cultural.

*cigarette