I thought I knew just about everything there was to know about using the bathroom.Apparently not.There are battles raging all across our great nation about which bathroom a man should use, and which bathroom a woman should use, and which bathroom a woman who believes she's a man should use.All of this is very confusing. It's even drawn a response from that old, bearded guy from "Duck Dynasty," who is always the person I turn to when formulating an important opinion.Said TV personality Phil Robertson, "Just because a man may feel like a woman doesn't mean he should be able to share a bathroom with my daughter or yours. That used to be called common sense.