The video isn't supporting your argument. He's talking against people that are adamant about a grammar that was abandoned before they were born, like ending a sentence on a preposition or the difference between "fewer" and "less." There's a huge difference between subtle changes in an ever-evolving language and completely destroying the most basic of words. Saying "there beign rediculous" is not what the video you linked was defending.
Getting too caught up in rules and such can be restrictive, but you should be able to tell the difference between words that have different spelling, pronunciations, and meanings (where, were, we're? REALLY?). Spelling shouldn't be a problem either, almost every browser and word processor corrects tell you when you're wrong. You have to go out of your way to misspell most words. It's ridiculous.