If such a petition/movement exists, I strongly suspect that it began, at least, as backlash against earlier protests against the display of the Confederate flag (especially the Battle Flag) at the ceremonies.
I fully expect to see blue-clad (Union) reenactors in the funeral cortege. Should they not bear the proper flag?
This entire subject of protesting what should be a solemn, historical ceremony is disgusting. No matter which side of the issue they are trying to hype, such intrusive opportunists are, IMNSHO, no better than the proverbial "[foreign object] in the punchbowl"...