Mayor laws are listed under "Cop Rules" on titsrp.com/rules
Laws can not target an individual group, class, job, or person. Make your laws general, and make them affect the entire town
You can not make a law to make someone above the law because it breaks role-play
I feel like your law of "Fishermen cannot be disrespected" would fall under this rule since you're technically making a law that targets everyone except them.