MagiStream

It very much depends on the person who writes as well as the situation. Some people obviously have dyslexia or similar problems, and while nobody can forbid you to feel annoyed by their grammar/spelling subjectively, you definitely shouldn't harrass them because of it. In some cases, it really seriously goes on my nerves, though. Especially comma faults can drive me crazy because I read text with a melody in my head. False and/or missing commas make the text melody feel messed-up, so I hate this. Also, in general it's FAR more annoying in large texts like stories or scientific articles than in simple stuff like chats.
(My main language is not English, in case someone wonders why I rant about comma faults while making some myself (possibly)).

Having seen bad grammar due to translation issues in video game dialogue. I can say that depending on the severity and how bad it is and whether or not the other person is a native english speaker. It can be annoying. Now I am reasonable when it comes to writing however if a a video games dialogue is badly translated and no attempt is made to polish it at a later date then it's just frustrating. That being said I only cut developers slack when they first release and if the game slowly gets it's dialogue polished and cleaned up over time.

As far as people goes it's situational and even I a native english speaker struggle with grammar issues. So I tend to try and help clarify if someone not familiar with language uses a word that doesn't fit with what they are trying to say. Because it can help them be better understood as long as it's done nicely and not rudely.

I get extremely bothered by stuff like this. I'm an extreme perfectionist, especially when it comes to writing, and take extra care when writing stuff all the time. Like even now as I'm typing this, I'm rereading what I type and making sure everything is spelled correctly. I know I probably don't have the best grammar in the world, but I always try to put in my best effort! When I see people put in minimal effort into writing things, it physically pains me. The thing that makes me really mad though, is when you see people put in texting language in their homework, resumes, published works etc. How does anyone in their right mind think that's alright?! Heck, I get all bothered if I have to write the word "lol" in a text! (Yeah, I'm one of those weird people who have to write everything in complete sentences in text messages.)

That being said, I am completely sympathetic with people who don't speak English well, young children, and people with dyslexia. I have two cousins who are dyslexic and they are both have a very hard time with reading and writing. Even though they have this disability, they are extremely smart kids, and I wish the school systems here would do way more to help them. I even think it would be nice someday that I get a job or to volunteer to help dyslexic kids to learn and enjoy reading.

Not to be a broken record here... but it really does depend on the situation. That being said, I would say in general that there is little to no excuse for bad grammar. 1) There are plenty of people out there to correct you (for better or for worse -.-*) and those that can help you improve; 2) most people who we expect proper grammar from have finished primary school where they should have learned proper grammar; 3) If it's just a text or they're... like, five. Ok, whatever. That's totally understandable. (Or if the written language isn't their native language). But if the current environment is one where appropriate grammar and spelling is expected, then every effort should be made by all the involved parties to write properly.

Roleplay, even though it's just meant for fun, is one that bothers me in particular. Homework, professional words, published things, etc... those are all obvious. But in *any* scenario where you're doing a large amount of writing, I think you owe it to the people reading the piece to use proper spelling and punctuation. By joining a roleplay or applying to a job, or whatever the circumstances are... I would say it's an understood agreement that you are going to provide something using proper grammar.

Now if you're a child, or if you have a disability, or you speak other languages, or if it's just casual... Obviously, I don't care. But I'd say "bothersome" isn't a strong enough word for when others simply don't care enough to write properly. Not only does it make the writer look bad, but it's rude to the people that will be reading it. Now... of course, mistakes happen. But after being corrected, or if it happens ALL THE TIME... come on. That's just lazy.

Yeah... that sounded a bit harsh. -.-' Sorry, folks. Just a pet peeve of mine.