yep. I'm slack with grammar myself, but if someone is
difficult to comprehend, there's where I start getting annoyed and immediately think you're not exactly the brightest sock in the knife drawer, haha.
If someone has perfect punctuation and little to no emoticons, I assume they're older. People in their twenties joke around a lot despite lacking the emoticons, while the 17-19 ages tend to sound all serious business. People in their late twenties to thirties use those...
ish emoticons in a very...separate fashion. If someone uses "XD", "._./.-.", "o-o", etc, with perfect punctuation, I assume they're teenagers or younger. I assume that people who mess up capitalization, use little emoticons, sound REALLY dramatic by SUDDENLY CAPITALIZING what they SAY, and misspell a lot are extremely young. I assume people who use ellipses and emoticons, misspell a lot, and talk in strange breaks are foreign. I assume people who use a lot of text speak on a forum are something that is too mean for me to say on tbt.
The tone changes pretty heftily depending on where someone hangs on the internet though! I can tell pretty well/fast when people come from 1.) tumblr 2.) reddit 3.) 4chan is so cool and edgy 4.) 4chan is ok if you stay away from /b/ 5.) spend most of their internet time on FB. Bad grammar can just be being casual in one place and in another, it just means you're...a sock. It kind of depends on if it's intentional I suppose.
I agree that it's kind of silly but at the same time I'm more often correct than I'm wrong in my assumptions concerning these kinds of things.