Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh

 

In the Name of Allah, the All-Merciful, the Mercy-Giving

 

All praise is due to Allah. Peace and blessings be upon His Messenger Muhammad.

 

I cannot make a judgment on this particular case as I do not know the full details or the context.

However, I would be emphatic in stating that Islam does not allow us to go around attacking those who criticize in Islam or its symbols. The Quran mentions the statements of those who vilified Islam and the Prophet and yet nowhere it sanctions Muslims to attack them. Allah says:

“You will surely be tried in your wealth and your souls, and indeed you shall hear many hurtful things from those who were given the Book before you, and from those who are idolators. But if you are patient and reverent, then that is indeed a course worthy of resolve.”  (Aal `Imra 3:186)

We have so many examples of the Prophet (peace be upon him) forgiving those who attacked him physically and verbally, yet he forgave them. Hundreds of his enemies who later became the vanguard of Islam were at one time his sworn enemies scheming to kill him or attack him. It was his magnanimity and mercy that turned them into his friends who were ready to become martyrs for his cause.
Almighty Allah knows best.