Outliers are more likely to post their experiences, and those unusual experiences are then also more likely to be shared. It can make for a skewed perception of the world if someone consumes a lot of media (or other secondhand information) and allows it to shape their worldview.
>>HPsqua+(OP)
And to your point, I think the psychology of someone in the comment section is to react to broad statements like they are Sudoku puzzle where you can "solve" by finding an exception to a broad statement, however rare the exception.