Language isn't proper or improper, it is either precise or it isn't. it is precise when it effectively conveys the information that the originator intended to

Language isn't proper or improper, it is either precise or it isn't. it is precise when it effectively conveys the information that the originator intended to send. breaking grammatical rules can in certain circumstances assist with this. but the vast majority of the time improper grammar impedes understanding. the fact that this misunderstanding is often minor enough and the type of mistake common enough that the reader can figure out what you mean isn't a valid excuse.