Constantinople is one of the many historic names of the city and I don’t get why you should get angry if someone uses it or not. Let’s leave those butt hurt Turkophobes and their unhealthy ideas about the city aside. No matter what they call the city it will never be their again so who cares?
Constantinople for me as a person who loves history is a very beautiful name of the city which Emperor Constantine the Great chose as the new capital of the Roman Empire- probably the greates Empire to ever exist.
It served as a Roman Capital and a center of the Mediterranean/Western world for thousands of years after that.
Let’s not forget that after Fatih Sultan Mehmet conquered the city he made it his capital, he declared himself as a Kaiser-i Rum / Roman Caesar and that one of the names for the city up until the Turkish language and name reforms of Ataturk was Konstantiniyye.
Istanbul (a name of greek origin too) was officially named that way long after 1453 in 1928 or something.
Istanbul comes in many names like Nova Roma, Constantinople, Byzantium, Tsargard many more. What gets on my nerves is the butthurts who constantly use constantinople because of their hate of the Turks.