Bad grammar.. bad life

Something that has really been annoying me lately is the fact that people can't seem to conquer the English language. Personally, I do not believe it is too difficult so when you're having a conversation with me please try to refrain from saying things like "one time I seen" you did not "seen" something you saw something. Also, a few days ago I was walking around campus when I heard a girl say "And then she was trying to teach us like sentence structure and I was like I ain't ever learned English like that before" really?! So all I am asking of you readers, is pay attention in school and possibly pick up a book once in a blue moon.