If passed, House Bill (HB)1664 would classify those actions as Class B misdemeanors under the Tennessee Code. The maximum penalties for a Class B misdemeanor conviction in Tennessee are fines of up to $500, as much as 6 months in jail, or both.
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Like the author, I don't pay a whole lot of attention if there's only a small percentage of bad reviews. Shit happens, people have bad days, and there's always a few people that nitpick something to death.
The entertainment value can be fun though - I saw one once where a guy gave a 1 star review because the guy that waited on him was wearing overalls, which apparently isn't 'professional dress' for somebody working in a hardware store. Seriously, the entire review was about the man's attire - not a word about the service, store or product purchased.