Yes! It drive me bonkers!
I try to use proper grammar and spelling in my posts to show that I am paying attention and devoting thought to the content. When someone posts gobbledygoock I tend to dismiss it as un-important. Most forums have rules against it anyway!
Even texting I spell it out unless it absolutely will not fit without an 'r' or 'u' here or there.
However, I have some leeway...
Cat macros (or whatever sort of macro) I can forgive. That's a style. It's meant to be funny in part BECAUSE of the bad spelling and grammar, etc.
And the occasional 'pwned' or whathaveyou is fine, again because it's used for humor value.