I'll tell you something else that's tiresome--members of minority religions (or no religion) telling Christians that listening to a Christian prayer at a high school graduation or commemorative ceremony is a "shocking violation" of their religious and civil rights. Just because the government has no right to endorse any particular religion (or demomination) doesn't mean that someone else has the right to repress it.
"... the government has no right to endorse any particular religion ..."
Correct. And the public schools are agencies of the government. Sectarian prayers should not be led by public officials acting in their official capacity.