Joey,
You are going to have to practise distinguishing between being right and communicating clearly.
You are absolutely correct that an SDS must be bonded somewhere (unless, of course, it is an intentionally ungrounded system, which should not be the case with a 208/120V system per NEC).
But now you need to communicate this to your boss. Calling him stupid in a public forum, especially if you've pointed him to the thread, does not make the case. If he has been in this job for 30 years, he probably is doing 99% of things perfectly, and probably absolutely certain that a couple of errors are 'how things should be done'. This is probably true for most professionals (not just electricians), and will probably be true for you after 30 years. You can't do your job without being sure in your knowledge, and sometimes you will be sure about the wrong things.
Your job is not to prove to this guy that you are right and he is wrong. Your job is to get him to figure out for himself that he is wrong. No matter how many times you prove things to him, all you will is get him defensive, and make him try harder to probe that he is right and you are wrong.
Try asking him why we bond at all. Ask him what would happen if the service was not bonded. Ask him what happens at these transformers with their ungrounded secondaries if there is a ground fault. Trace out the circuits and current flows together. Be open to learning from him, and be willing to admit that you are wrong if he shows you a low impedance path for ground faults. Get creative in how you approach this, rather than angry.
-Jon