Woah is not a misspelling. Woah is an alternative spelling. What makes it an alternative spelling, not a misspelling, is the fact that people do not write woah because they don't know how to spell whoa. People write woah because it's how they spell the word.
When you correct people that use "woah", you're not being helpful in any way. You're wasting your time, forcing them to read nonsense, and overall being a language nazi that doesn't even know what the rules of the language are. You didn't post a valid correction. You posted pseudo-intellectual garbage. Your correction is not correct. You are hostile. Stop posting.
There's no argument to be made for refusing new spelling forms because the old ones are fine. English spelling is a fucking disaster. If people want to start using a more phonetic spelling, fucking let them.