I'm talking about the things people say on internet forums like HN about propaganda and related terms (astroturfing, shilling, brigading, foreign agents). At least on HN I can tell you that "most" is an understatement. That's plain from the comments and even more plain in the voting data. (I should make that more precise, though. Obviously I'm not reading people's minds to know why they say 'propaganda', etc.; it's rather that what people say about this is overwhelmingly correlated with whatever their view on the underlying issue happens to be.)

Elementary school is a pretty different context. Schoolchildren may be more reliable on this, actually. Although they tend to imbibe the views of their parents, they haven't yet had time to build up the same fixed emotional habits around them.