Why do adults tell kids and tells to “get over it” when they complain?

Observation:
You do a lot of complaining here about how you are treated (often, you characterize it as MIStreatment, unfair treatment, etc.).

Observation:
Like any person, you know your own point of view, and you report that, because it is the to which you have the best access. (You can't be expected to report on the mind/thoughts, feelings, etc., of the adults or anyone
else, right?)

Idea/Observations from my life:
Do you ever stop and look ai it from the adult's point of view? I know that you did for the car problem, and understood that a new, working car took precedence (financially) over a trip which you all wanted to take.

PERHAPS sometimes you should cut the adult(s) some slack, because

a) just like you, they actually do NOT have all the answers,

b) just like you, they make mistakes, errors in planning or judgment, estimates of time, etc.

c) just like you...they are human, so they WILL mess up

d) they often have/had stresses & worries which _you_ didn't have.

And, to try to raise this as delicately as possible, your condition might make you more...insistent, for instance, than you might otherwise be. If someone is already tired, irritated, worried, etc., continued/contimual questioning can seem like "needling", which doesn't feel good.

CONCLUSION
Try to look at the situation from the other person's point of view. If you are having trouble understanding, just ask *that*, focusing on the other person. It is often compassionate to demonstrate an interest in where the other person is "coming from".