Stupidity is excusable, the stupid person is incapable of learning. There is no excuse for ignorance. Nothing marks a person as quickly as improper grammar.

Language was invented to allow one person to reveal their thoughts to another person quickly and accurately. We call it communication, and it is the foundation of civilization. The English language is particularly powerful, because of its rich vocabulary of words that allow the educated person to choose nuances and shades of meaning to precisely define the exact concept they intend to convey.

It is demonstrable that societies having rudimentary languages, that can only express thoughts with imprecision, suffer from arrested development of social, scientific, and technological systems.

There is no excuse for people, with the ability to learn, being unable or unwilling to use language effectively. It is a sign of intellectual laziness, lack of personal pride and a disdain for the persons with whom they are trying to communicate. In short, it is rude. It is also a sign of the dumbing down of society that we have all seen in recent years. A pandering to those too lazy to learn, and the result of an educational system that has failed because it is run by, and staffed by, too many inept or uncaring people.

Fortunately, it is never too late to learn. If one has been cheated by their teachers, or was too lazy to learn from them in school, there are many ways to make up for it. Why bother? Because you would not believe how many otherwise capable applicants have failed to get a good job simply because they could not write a simple coherent sentence, or speak like an educated person. Strive to learn something new every day of your life.