Edit: A few people have interpreted the title as serious, so I wanna clarify that it was meant as a sarcastic joke about how little sense the neurotypical world makes to me, but it is still legitimately me asking for help understanding said neurotypical world.
Was having a conversation with a friend today about why I seem unapproachable to people online. Apparently it's for 2 reasons.
One is that I say "K." all the time, as a short way of saying okay. She pointed out that most people find this rude and offensive. This kinda baffled me, because like why? She explained that like, if somebody were to give a long emotional speech and I just responded "K." that would be offensive. That confounds me. So it's rude in one context, and neurotypicals have decided to be offended by it in all contexts? But the reason it's rude is what confuses me more. Apparently it's considered lazy because you could have just typed out the word, but like, that applies to all text speech and nobody's mad about people shortening those words.
But it got more confusing when she explained the second reason, which is that I end all of my sentences with proper punctuation, which she said "makes people feel like I'm done with the conversation and not interested." But just a second ago improper grammar was rude, and now proper grammar is rude instead.
It baffles me. You can't just use proper or improper grammar. Use too much improper grammar and you're lazy and rude. Use too little and you're also rude. But you can't just use any improper grammar, you have to use the very specific subset of improper grammar that's been deemed acceptable and not lazy (even though it's exactly as lazy as what they do consider lazy.)
To be clear, I'm not bitter, and I'm definitely gonna adjust my behavior to hopefully seem a little less rude to people. I think that's just a nice thing to do. I just find the neurotypical mind utterly fascinating. I don't think they even realize how many contradictions exist in the social rules they all so easily accept.
Your friend is at least partially misinforming you. It's fine to write k instead of ok in almost all situations. But either of them can be rude if the other person would expect more emotive words. For example here's when k is fine:
Them: Bring my pen when you come into the other room
You: k
And here's where k is not fine:
Them: Wanna go grab some drinks tonight at 8?
You: k
That's rude. They would want to hear you actually be interested in their invitation. Like saying "great" or "I'm in" or whatever.
To make things more confusing, responding to an invitation to drinks with "k!" might be ok, depending on who's asking and the context.
If it's your roommate asking, and they're doing it because there's a sporting event or because drinks are an established ritual, it'd be fine. If it's your boss, or a new (potential) friend or colleague, a possible romantic interest, or a close friend and it's not something they usually do or invite you out for, then those situations have a lot more weight, and expect a more fulsome and engaged reply.