Eh, I don't know if I'd go as far as saying it's spitting on our most sacred traditions. But also, I would not consider the honorable ceremony as theater either. It's important to many people who served. They want to honor fallen soldiers' sacrifice. It's something I don't fully understand myself not being in the military. But I understand enough to know it's more than theater to many of them.
I am fairly certain Pelosi has never served in the armed forces so she has no clue what the flag means to them as she has no baseline for it. To her I suspect it's just another prop to use as she sees fit to pander to get base.