There are some communities where the common rules of humanity do not apply. In these communities which are most prevalent in low income areas or those involved in conflict, common etiquette and decency is not to be expected. Unfortunately, these areas are also quite prevalent in the United States.
Modern society has certain rules when it comes to behavior. It is things such as not mistreating animals, not ganging up on individuals, and not hitting a female. In these communities, one should not expect these type of rules to apply. Sometimes it will not matter what gender you are, as they will gang up on you and attack you either way.