He may have only been making an innocent observation, in an effort to draw you out. Admittedly lame, it's at least better than making an off-hand comment about your hair, your eyes, your lips, or your cleavage.
If I may, I suggest that you don't turn away so quickly next time. Maybe say something like, "I'd rather listen" instead.
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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.