Language is a way to communicate an idea. [put a period here, you're on your way to a comma splice] If someone doesn't use proper grammar, English, or spelling, yet they communicate their idea clearly enough for someone to understand it, [comma you've got some clause action going on here] is it really necessary to nit pick the little things?
People use spelling and grammar to judge a person's [intelligence is a possessed thing] intelligence, [comma: coordinating conjunction] yet language is a very flexible and fluid thing. [Comma splice again. You'd get an F in any entry level college English]Using something as petty as spelling and grammar to judge a persons intelligence is just as prejudice as using someone's [possession yet again] color of skin, religion, [comma: list of things] or sports team preference.
So, [comma: introductory word] if your a grammar or spelling Nazi just get over it, [more clause action] and find something else to be O.C.D. [you need periods when you're doing initials] about.