First how old are you?
For some reason I've be wanting someone to ask this kind of question.
Second you have to know something. PARENTS ARE HUMANS TOO, THEY MAKE MISTAKES. As parents sometimes we have the tendency to deal with certain situations by shutting you guys down, before giving you the chance to explain yourself. It can be because of a lot of things, specially stress.
This being said, Being unfair with our kids sometimes does not mean you guys are going to understand that. and to be quite honest it does not mean you guys necessaraly did something wrong.
I'm not trying to cover your mom, for what she did, I'm trying to explain to you something that you might not understand yet. At the same time, this does not mean that your mom is right .
Are you the middle child? I have notice in the past few months that middle childs in families are usually treated different then the other two childs.
I can't really tell you what to do, but i can tell you is that WE ALL MAKE MISTAKES EVEN PARENTS, You probably were not doing anything bad, is just the you caught your mom at the wrong moment.
But, if your mom is one of those woman that you can talk to once in a while, then ask her but be blunt and straight with her, you don't need to be disrespectfull, just be direct. If she is not that type of mother, then let me tell something, she is going to think that she is always right no matter what you do.
But you can't stop trying to talk her and ask her questions when you have a doubt. Eventually it will sink in to your mom.
Good luck