Fair enough. But would you object to telling people that they should at least consider how the costume they might wear or sign they might carry will be depicted in the mainstream media and look to outsiders and expect them to care about it making conservatives look bad if it likely will?
That’s different than telling people they shouldn’t wear costumes or carry signs. Folks should consider how their message is received, but don’t alienate protesters by putting them in a straitjacket of rigid behavior.