I just set my phone down on an angry customer
Did you just set the phone on the counter?
Yes, I am so angry. I wanted the conversation to finish by itself after some time passes
I feel like you should be more mindful about what you say with customers and continue to act professional. It goes both ways as customer should also treat you with respect, but if they don't then you can be the bigger person and just do not take it personally.
I only wanted to avoid the long wait and no one has the right to question my actions.
No one wants to wait for a long time and it feels like you're not doing your job properly if you make the customer wait or not try to address them by avoiding them. I do hope you get proper training and attitude towards difficult customers like this so that you are better prepared for their behavior.