How about we don't do that?

So, it's not like I'm not used to these kinds of things. But it's started to frustrate me more and more as I get older.
First of all, I'm 21. I'm not a child. I don't act like one. Unless, you treat me like one.Then you will see what a good impersonation of a psycho 13 year old I can do. It's actually pretty amazing if I do say so myself. I can whine and throw a huge tantrum. I can give more attitude than any 13 year old could ever hope to have. But, I generally don't act that way. I've been told since I was little that I'm mature for my age. So don't talk to me like I know nothing about the world. Don't pat me on the head. Don't assume you can be condescending just because I'm younger than you. It won't fly with me. I'm nice. Most of the time. But, give me a reason not to be and I don't care who you are the switch will be flipped and you won't like me anymore.
Secondly, and this goes with the above rant, just because you are old does not mean I have to respect you. If you don't respect me, I can guarantee I won't respect you. Your age doesn't make you a better person. And our generation has been taught not to stand for any disrespect, no matter who it's from. So, if you cut me in line at a store, I'll say something. If you can't drive your car, I'll tell you to get off the road. I know you look at us young people and think we're all the same, we're not. You can't judge us all and expect us to just accept it and treat you like you're something special.
And finally, another respect thing, I am quiet and I am a woman. Neither of these things mean that I am less of a person than anyone else. I don't speak up very often. I probably should. But, when i do say something you should probably listen. If I'm talking it means it's something that is important to me. And I don't care who you are, if you are a male you don't get to treat me like dirt. Sorry, but you don't. Actually, you're supposed to treat women with more respect. I know chivalry is dead all but c'mon. It's not like I'm asking you to throw your jacket over a puddle for me. I'm fully capable of walking around the puddle. I'm fully capable of opening my own car door. All I'm asking is that if I politely say "excuse me", move out of the way. I'll only say it once before I push you out of the way. Again, you're not better than me just because of your gender.