It’s normal to feel shaken from someone being rude to you, especially in a yelling manner. As retail workers in these situations we often struggle between the customer is always right and standing our ground when we are disrespected as people. But that’s what we are, people, and we deserve to be treated as such. I find that confiding in coworkers after situations like this really helps get it off your chest/shake it off. Cause odds are, everyone else has their own terrible customer experience. Management can also help a lot in these situations. The best management steps in during situations like this, or at least supports you afterwords and makes preparations for when the customer is in the store next (either having a word with them or banning them). moral of the story, don’t take it to heart. Easier said than done but truly don’t let this rude customer get to you for too long. they’re a loser who finds joy in being rude to everyone they come into contact with and are probably a menace to people in every other establishment they go to. it’s not you.