It is not, the appropriate response to this post is to downvote and reply with a terse comment on the misuse of the apostrophe.
Generally correct, especially if it's too subtle for the varied age groupings and interests - everyone's hair-triggered to get butthurt about some triviality. Eventually the adults will show up in most threads and will occasionally be bothered to correct the karma injustice.
I’ve noticed it depends on your karma score and reputation
I don’t think people check karma scores. (I never do.) More likely it’s a factor of being on the site long enough to learn what jokes you can slip in without getting downvoted. That would correlate strongly with karma and good reputation.