My friend, the person you are speaking with is an immature brat.
The Chinese were the first to produce the rocket. This was passed onto many different people. Mainly the Turks, which brought it to Europe.
Fast-forward some hundred years and the Germans were making progress in rocket technology.
After World War II, the Americans captured these German scientists and made progress in rocket and missile technology.
Today, Indians praise themselves for producing ICBMs from other nations' technology based off of the original Chinese rocket.
The irony is that these people are accusing the Chinese of copying technology.
A funny world we live in, my friend.