Answer: After 12 years, it seems odd that your workplace has suddenly become unbearable. Either you have a very long fuse or something has recently changed. Regardless of the reason, you are on the verge of making a potentially disastrous mistake.
For a moment, imagine that you have left this rowdy place. You join a company where policies are strictly enforced and everyone is quiet and reserved, but your job is boring and your boss is a jerk. In retrospect, your present environment might seem like nirvana.
If these boisterous antics actually impede your performance, you should discuss the problem with your boss. But if not, then the real problem is that you’ve allowed yourself to get all worked up about things that don’t directly affect you.
Instead of fretting about how people dress and talk in other departments, try to count your occupational blessings. You enjoy your work, like your manager, and are well-compensated for your efforts. Do you have any idea how many people would kill to be in your situation?
How much do you like your job? Give it a rating on the "Happiness Scale": Rate Your Job on the Happiness Scale.