That’s a really odd statement.
Could you please give me some specific details on when the Chaldeans were busy slaughtering Muslims or when Syrian Christians engaged in such behavior?.
I"m not familiar with Arab Christians outside of Lebanon engaged in slaughter of Arab Muslims, nor for that matter am I aware of Muslims who’ve accused Arab Christians, outside of some Lebanese groups, engaged in such behavior.
I suppose you could bring up the Armenians when the Dashniaks tried to carve an independent Armenia, but that was, literally, a hundred years ago, nobody but the Turks remembers or cares, and the Ottomans did more than get their revenge.
As it is, for well over a thousand years, in most Middle Eastern countries it was Muslims who were the people in power and the Christians who were the minorities who generally faced soft discrimination which got vastly worse when Muslims felt threatened by outside forces, most notably the breakup of the Ottoman Empire, the collapse of various tinpot dictatorships, the creation of Israel, and of course recent events.
Respectfully, perhaps I’m wrong, but I think you may have made a poorly thought out comment that inadvertently insulted people being slaughtered who don’t deserve it and patronized the people doing the slaughtering.