I'm not a super hotheaded person at all. When customers are mean to me I can always brush it off and I don't really have a problem with continuing to be polite to them, but today I was seriously considering if it was worth it to just mouth off at this couple today. I was soloing drive thru and this older couple pulled in. I asked them what I could make for them and the man, who was in the passenger seat, ordered an iced honey almondmilk latte. I had trouble hearing him because he was in the Passenger Seat, one of my BIGGEST pet peeves when I do DTO, so I had to make him repeat himself a few times. On top of that, I've only been working here for a month or two, and no one had ever ordered that before, so I was having trouble finding the button for it. After it was all figured out, his wife ordered a hot latte. I greeted them at the window, and the man leaned over and in the most smug and belittling tone, said "did you understand what our order was? do you know which one was hot and which one was iced?" and i was like yes......... and he then said "okay, which one was it? :)" he literally QUIZZED me on which drink was which. I felt so belittled and disrespected. He talked to me like I was a stupid child and that I needed his help. After they got everything, they told me to have a good day and I couldn't find it in me to say anything back, so I just gave them a half-assed wave. I know that was my bad, but I felt that they didn't deserve respect if they weren't gonna give it to me. I was super upbeat and friendly while I was taking their order and I apologized for the misunderstanding. The only good thing that came from this interaction is that it finally gave me the motivation to get the ball rolling on starting a payment plan for certification courses of what I actually wanna do with my life.