dwelling on things

Basically one of those little things happen where somebody is rude or whatever, and I cannot it go, it bothers me forever. And in most cases, I've done nothing wrong, and I should just be able to go, "Wow, what a jerk," and move on.

But I find myself replaying the situation over and over in my head, and I just want to yell at them. Very rarely am I able to actually communicate with the person and tell them they hurt my feelings. Couple of examples,

(I work as a barista, at UPS Store, and as a freelance graphic designer)

At the coffee place, a regular came in, and my co-worker was on her break, but the regular was like, "Are you [her] going to make my drink?" And the girl was like, "No, I'm on my break."

So I start making it, and the lady goes over to talk with my coworker and tells her, (she doesn't realize I can hear her) "I don't want her making it"

... To my coworker, in front of ANOTHER coworker, and infront of other customers. I am really good at what I do, and I can't think of any reason why she wouldn't want me to make it. Honestly, I've heard from almost every customer, that I'm a better barista than the girl she was talking to.

I actually got the balls to say something to her the next time she came in. Okay, check this out... her "problem" with me:

She get's a smoothie. She get's whipped cream on top. We use home made whipped cream out of a seltzer dispenser. Sometimes, there's a lot of pressure in the container, and she got a drink on the first squirt of the container, so some of the whipped cream went to the bottom of her cup.

She got all upset and said I was "cheating" her. I explained... told her that we used recipes, and that she got the amount she was supposed to... so that's what she had been holding onto.

I'm just flabbergasted that a grown woman would not only be so petty, but would dispay the sort of catty behavior I expect from a girl in junior high school.

This was like two weeks ago and I can't let it go.

I keep thinking of what smart thing I could say to her the next time she comes in.

And today, I went to drop off an invoice at the new business I designed a logo for. It's right next to an art store. I bought my supplies there to do the logo, even though they have $#%^ supplies at rediculous prices. The sales girl knows me. It's a duplex type business. So I asked if I could leave an envelope with her, with an invoice because the guy had left for lunch, and the floors had just been painted, so I couldn't go in and leave it.

She was like, "No I don't think so hun, this an art supply store." I cannot describe in words how rudely and condesendingly she said it. Beyond that, this woman is a moron. I told her, "Um, well, it's literally a piece of paper with an amount written on it, it's nothing I'd care if you lost, but if that's the kind of neighbor you want to be, I'll remember that the next time I need art supplies." So then she's like, "Well January, I guess I could keep in under the register,"
I was so angry at the way she had talked to me, and in front of a bunch of people, that I told her never mind, because she's an idiot and would probably loose it and stormed out.

I'm just like WTF? How dare you talk to me like that, and this is a small town. People do stuff like this all the time. She used to come into the print shop I worked, and I'd help her make stupid collages. It wasn't my job, and if I'd cut something wrong, she could (and probably would) have freaked out, but that's the kind of stuff you do in small towns. I just like want to be in a situation where she needs something from me and I can just remind her of this little incident.

It's really hard to interact with people and I just feel like these little "tiffs" are too hard. I can't get over them

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I have this same problem but I still have things going round in my mind from like 10 years ago.