fad
fad/
noun
noun: fad; plural noun: fads
an intense and widely shared enthusiasm for something, especially one that is short-lived; a craze.
"some regard green politics as no more than the latest fad"
synonyms:
craze, vogue, trend, fashion, mode, enthusiasm, passion, infatuation, love, obsession, mania, rage, compulsion, fixation, fetish, weakness, fancy, taste, novelty, whim, fascination, preoccupation.
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Chuntering on about a personal, if impressive life experience:
Not the same as being an expert in everybody else.