My Company's Favorite Jokes

For some reason people who've been with the company for longer than two years generate a form of humour that's kind of subtle, and oh so very typical. It is also very shallow, and is repeated far too often the higher you get up the pyramid.
Jokes include:

• if you happen to leave at about 17:00, people will quip "you got the afternoon off boy?" or "working half days now are we?"
• when you've been around, you're bound to have left behind a lot of projects, teams and old friends. If you did good, you probably meet up again at a banquet, company drink, or dinner. Managers always like to joke about "hey, did you hear already? you're coming back to the team next week!"
• somebody in another team messes up, that person becomes a running joke throughout the week. If someone in your own team messes up, you ignore it.
  

Somehow this has to be a sign that the company culture is not heading in the right direction. I just can't tell which sign.