There are many different kinds of swastikas and you have to be careful which one you carve into the washroom stalls. I'm going to go out on a limb here and say that 99.2573% of all washroom swastikas are supposed to be Hitler's Nazi swastika - but 72.8667% of the time the vandal has used the wrong swastika. Different swastikas mean different things.
Notice that none of the above swastikas have anything to do with Nazis? Except maybe the Coca-Cola one.
Just have adequate knowledge of the symbols you employ.