I only recognize rhetorical questions if I'm paying close attention to the person I'm talking to. If I'm distracted, all bets are off.
My biggest problem is that I hardly ever get the tone of voice for a rhetorical question right when I ask them myself, and end up offending people or having to say "That was a rhetorical question!", which can be quite wearing. Therefore, I have ceased asking them of most people, much to my chagrin, as I end up suppressing a good deal of my sarcastic humor that way. Not that most of my same-age peers understand my humor anyway...
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Life is a long series of juxtapositions, ironies, and paradoxes.