Question:
Is there anything halachically or hashkafically wrong with writing a negative review online for a jewish establishment i.e. restaraunt etc. for which the customer had a bad experience?
Answer:
It might be halachically wrong. May over all the restaurant is fine and the bad experience was a one time occurrence-mistakes do happen. Also the proprietors should be warned beforehand that if they do not make amends, you will publicize the bad experience.
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