I'm no nationalistic fanatic of the flag, but is it really so difficult to understand that the flag is a symbol?
Obviously each flag, be they for nations or other groups, represents more than just a piece of cloth to many people. Taking offence at someone else's identifying with what a flag symbolizes is not okay. But, I tend to look skeptically at worship of any kind of idol, be it flag, cross, or text. That still doesn't mean it's okay to hate or persecute people for their beliefs, even if they appear silly to you and as long as they don't hurt others.
One group can demonstrate their respect for the nation by physically following some rules around the flag and others can demonstrate their loyalty to their ideals of the nation being violated by flying the flag upside down or burning a flag.
A flag or banner is not just a piece of cloth, never has been.
At no point did I make anything close to a claim like this. In fact I very clearly stated that hurting others was NOT OK.