Can you give us a few examples of your snappy attitude? Then we might be able to help you.
I get annoyed very easily and the I can't keep my mouth shout about it.
For example, if there are two people in front of me walking in the mid of the sidewalk at a very S-L-O-W pace, I start screaming i
n my head "Jeez, do you really have ALL DAY to waste, don't you?!".
My grandma always told me to try to cause as little discomfort as possible to other people, so: walk on one side of the sidewalk, don't stand in the middle, think about people who might need to walk faster, be proactive in figuring other people's needs.
When it is raining and I am about to cross the street on a crosswalk, I can't stand people in a car not letting me pass. In Italy they don't usually stop for pedestrians, unless they are already crossing the street or are carrying a burden, a baby or there is an elderly crossing, but here in Argentina they RUN OVER YOU shamelessly.
Snappy attitude: I start yelling them "Vaff****o, do you think crosswalk are decorations?!" and I wish I had an hammer to break their windows, so that they'd learn their lesson.
Also, I am pretty straightforward: if I am calling someone to arrange a time to meet, I expect to end the call within 10' with a time and a place, not with a generic "dinner time" after 20 minutes of chit chat. Especially if we are talking about the same day and if there are other persons involved. This
regularly happens when trying to make plans with my boyfriend's family (he does the talking over the phone).
Snappy attitude: I start yelling "Holy moly how is it possible you didn't get a time and a place?! You've been on the phone 30 f*ing minutes, what have you been talking about? Boludo!"
I don't like when people try to upsell, if I enter a shop with a specific request, I already made my mind before walking in. I understand marketing and stuff, but if I come in for a nail polisher and you don't have it, don't try to sell me a lipstick, it makes me feel a dumb prey.
Snappy attitude: I walk away too fast and it is considered rude, while too me I am just making them a favor to avoid wasting time when I am already sure I am not interested in buying something else.
I can't stand lies, and I am not a good liar. And very often I think that courteous wordings are just blatant lies everybody is fine with it. In the example above, once I get my answer "Sorry, we don't have it", I say "Too bad, thanks anyway" and I am already out of the store, while I gather that I should show some support for the poor sale assistant, wait for her to pitch in with some upselling, fake being interested and close with "I'll think about it".
Snappy attitude: In general, if someone is bullshitting me, I say openly "Bullshit" or I walk away, while in certain situations I should let the other people "win", smile, and try to bullshit back.
I hardly cope with other people's OCDs. There is this 'relative' that insists on keeping on
my kitchen light even if he is sit in the living room facing the other way. I turn it off, he turns it on. I open a window, he closes that window. Frankly, when this happens twice in a row it gets kind of weird. A nice "Please, can you close the window that I am cold?" would be perfectly fine, especially because this person is a relative of my boyfriend and has been knowing me for 2 months.
In general, my boyfriend tells me that I should be more accommodating and that I should look after my own interests, even if that means to "play" along some bullshit, "accepting" an undefined answer, letting someone "win" and keep the lights on, etc.
I think part of my snappy attitude is that I make efforts to avoid certain behaviors - that keeps my mind busy all the time, and I am angry that someone gets along fine without all these self-controlling actions. I am not saying I am never wrong, but if I am carelessly walking in the mid of the sidewalk and I notice someone trying to pass me, immediately I am reminded that I should walk on the side and not in the middle.
Or if I turn on a light and then the owner of the house turns it off, I think "I shouldn't have turned it on in the first place" and I won't repeat the mistake.
Or if I am making plans who involve a third and a fourth persons, I try to define everything as much in advance as possible, so that they all have time to make arrangements of their own.