Why can't people use even basic grammar in emails?

[Slim]

I may not respond back solely based on it looking as if written by a 5 year old.

People who write like that are a huge pet peeve of mine. I love it when I jump on the punctuation or syntax train and people say they don't care how they write on a forum because it not like it's an English class or anything...

Yeah, here's a simple truth for you, people perceive you based on how you dress, speak, and yes, even write. If you want to be perceived as a window licking idiot, by all means, write 57 likes of crap with narry a capital letter or comma in sight.