Flag burning is a highly disgraceful behavior as you burn the symbolic meaning behind it, that is why it's used as a form of protest.
For example, if one burns a flag of a nation, they also mean the norms and the people as a whole, their mindset, everything about them, and not merely the "government".
It's an act of treason to a nation in many places to burn a flag, even if this is for activist causes, within a sovereign nation.
Palestinians and Iranians and basically the whole Middle Eastern People do frequently create rolls of toilet paper with the Israeli flag or use this as kitchen cleaning paper, as a form of cultural protest.