Welcome and lol! You're retired friend might be a retarded friend. Jk jk. I guess a cop can charge you with what ever they want, it's a matter of how the da and judge sees it. That is as rediculous as being charged for a publIc nuisance for talking on your phone at peets coffee. (with out a gun)
edit. You are smart to not take legal advice from a cop. They are not required to know the law, they are as useful for legal advice as a mall security guard.