exactly. I believe I could post anything under the guise it is true and a great majority would share it as gospel as long as it is something they already agree with
That is the league rules that I found online as a PDF. If Coach is making an assertion, then he should at least provide evidence.
According to other sources, there is no rule requiring players to stand.
If I am wrong, then I am wrong. Heck, it just needs to be put to rest.