When it comes to languages, why can't people just stick with the standard version?

As someone who studied Spanish in school as a third languages, it drives me mad when people don't talk proper Spanish. Como te llamas is prounounced Como te YA mas, NOT Como te JA mas! I'm not asking about your pajamas. And your name is Juan CarloS, NOT Juan Carlo! And you learned your improper Spanish at an escuela NOT an ecuela.

You got Mexicans who can't understand Cubans.

And it's not just Spanish. Morrocan "Arabic", is completely incomprehensible to other Arab speakers and practically a different language.

PLEASE! Just pick ONE freakin' dialect and stick with it! And if it ain't broke, don't fix it!

When it comes to languages, why can't people just stick with the standard version?
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