English version

armchair critic

From Longman Dictionary of Contemporary Englisharmchair criticarmchair criticCRITICIZEsomeone who criticizes other people but who does not have any proper experience of the activity the other people are doing critic
Examples from the Corpus
armchair criticAnd it has a billion armchair critics, so clothes do count.I did not intend to foster more armchair critics of the public schools either.
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