Different contributor here. Please permit me to assist.
"Selective enforcement" is considered a violation of the U.S. Constitution, 14th Amendment where: (1) the person, compared with others similarly situated, was selectively treated, and (2) the selective treatment was motivated by an intention to discriminate on the basis of impermissible considerations, such as race or religion, to punish or inhibit the exercise of constitutional rights, or by a malicious or bad faith intent to injure the person.
FSK Drug Corp. v. Perales, 960 F.2d 6, 10 (2d Cir.1992).
Depending on how the Health Department is enforcing the ordinance, i.e., via a civil or criminal complaint or by administrative hearing, you would alternatively: (1) answer the complaint with a denial of the charges, and an affirmative defense claiming selective enforcement; (2) plead not guilty, and attempt to show at trial, facts proving that you are being singled out for punishment, because of your past actions against allegedly corrupt officials; or (3) defend at the administrative hearing on grounds of selective enforcement, in the same manner is with #1, and then if you lose, appeal for a writ of mandate (review of the administrative orders) to the Superior Court, or file a lawsuit in U.S. District Court for violation of Equal Protection. and 42 U.S.C. Sec. 1983 (deprivation of rights under color of law).
You could also file a complaint with the U.S. Department of Justice, Civil Rights Division, and you could seek assistance from the NJ chapter of the ACLU.
Note: This is actually a pretty difficult legal case. Selective enforcement actions are very difficult to win. I believe you will need a lawyer with experience in civil rights law.
I hope I've answered your question. Please let me know if you require further clarification. And, please provide a positive feedback rating for my answer -- otherwise, I receive nothing for my efforts in your behalf.
Thanks again for using Justanswer!