I've seen similar.. though not remotely as ugly as that... Usually I would encourage that you just practice and let them have their fun... I would expect it to wear off within a while. However it sounds really bad. If they force you into the same behaviour and loose focus on good honest practice over strange semi-japanese
Funny thing is that the least japanese dojo's I've been to have been in... well yes... Japan. In the west we tend to overemphazise every little aspect of dojo-kun until we get the hang of it. Like driving a car.. the first couple of month's/years we are consious about all the rules and do's/dont's - then we start to relax and act according to the situation.
Guess the best you can do is to invite a good japanese no-nonsens sensei to stay for a while.. once he is done laughing he will probably get the whole thing back on track again
Seriously though... I think you should calmly raise the matter at the next general assembly or other relevant occasion. Simply tell them you have a hard time understanding how this 'more japanese than the japanese' approach (don't use that expression) will help the students learn aikido. Don't fuss or blaim them for being wrong - just open the debate, and if they aren't able to allow a student to be selective about the rules, then you should seriously consider taking yourself somewhere else. Give it a fair shot - and if it fails, vote with your feet.
I hope it will all fall into places for you.