The biggest thing to remember when dealing with people you may not necessarily agree with is that we are all entitled to our own opinions. How a person acts, what a person says, what decisions are made are all internal decisions. We have no control or power over anyone but ourselves. But what we do have control over is how we handle the situation. It is easy to just ignore the behavior with the mindset, "well, they suck and I know what's right so screw them." But that type of thinking comes from a negative place and then we lose the pure intentions we must always have when making decisions. In the case of the rude woman you dealt with, your intentions switched to just getting the job done for the sake of it and getting your money. When it really should've been to help the woman with whatever job she needed done through the service you are passionate about. Instead you should approach it as, "I've been rude and cold before, so I understand how she's feeling. I don't take it personally or blame/judge her because we are all only human." Don't let your intentions get polluted by others actions.