Personally, I don't feel like being annoyed that someone jumped into your RP without making sure it's okay with the group necessarily makes you a bad roleplayer. Not all private roleplays start out private, and people have been known to use public areas to represent private areas that cannot be accessed. (People's houses for instance)
Not to mention that just jumping in like you own the place would seem a bit rude to anyone, and for all they know you could be another griefer (they've been known to jump in pretending they're going to play along and end up doing something ridiculous like undressing their characters and doing inappropriate things to your character).
Simply sending an OOC message or a /tell asking if it's alright to join in wouldn't hurt you anybody else, and it shows that you respect their space. You'll be treated with less hesitation and annoyance, and you'll find that people rarely refuse to let you play.
Some people like jumping in, and that's fine, but you probably shouldn't expect everyone to be okay with it, and you definitely shouldn't write anyone who isn't off as a bad roleplayer.
Not to mention that just jumping in like you own the place would seem a bit rude to anyone, and for all they know you could be another griefer (they've been known to jump in pretending they're going to play along and end up doing something ridiculous like undressing their characters and doing inappropriate things to your character).
Simply sending an OOC message or a /tell asking if it's alright to join in wouldn't hurt you anybody else, and it shows that you respect their space. You'll be treated with less hesitation and annoyance, and you'll find that people rarely refuse to let you play.
Some people like jumping in, and that's fine, but you probably shouldn't expect everyone to be okay with it, and you definitely shouldn't write anyone who isn't off as a bad roleplayer.