If you think that the rudeness is based on a resolvable misunderstanding, you can extend the confrontation by asking them why they are behaving this way. If they give a rational response that you can address, go for it. If you can resolve the tension, that's the best possible scenario. At the same time, you may just unleash a flurry of angry nonsense that fails to justify their actions. At that point, recognize you've done all you can and proceed with the next step.Some people genuinely don't realize they're being rude. They may not have learned certain social skills. In case you have encountered someone like this, you may want to politely inform that they have been rude. You'll generally get an apology straight away. If not, it may just take patience or avoidance.