OK, I'm going to be an ass here, because the whole point of this thread appears to be just that. In your post you failed to use a required definite article, have a dangling particle, and began a sentence with "but". All of that in three sentences. According to my inner English teacher your grammar is atrocious. That said, I understood you perfectly, and have no trouble replying to the meat and intention of your post. You could argue that the mistakes you made were related to relatively obscure rules of grammar. You'd be right. That's not the point.
Everyone has a certainly level of skill and/or practice in the art of writing. Not everyone knows all the rules of grammar or punctuation. You clearly don't know all of them, or you wouldn't have made the mistakes you did in a post complaining about grammar. I don't pretend that I know all of them either, English Grammar is fairly complex and in a constant state of development.
If the post is written in sufficiently comprehensible English for you to understand and reply, it's probably good enough. Would it be nice if people took more time with their written communications? Yes. Do I tend to take people's opinions more seriously, when they are better communicated? Yes. Do I expect every post I come across on the Internet to be art? Not by a long shot.
By the way, the inner English teacher says it should look like:
I know a lot of people don't care about proper grammar (in their native language no less). You have to understand that you sound ridiculous when you spell things improperly, use/don't use proper punctuation, or spl like ur txting. If you could actually hear what it sounds like, here's an example: