Did I say too much??

During a recital I gave in Vienna, in a large home as I recall, I mingled with the audience during intermission, as that occasion was very informal.
A middle-aged gentleman approached me, and as I had included some Mozart on the program, he evidently wanted to discuss the composer with me.
The discussion did not last very long, as he began , with a tone of some pride, by stating that "of course you know that Mozart was an Austrian."
I replied by reminding him that "while the people in Prague were whistling his tunes, he was starving here in Western Austria."
As the gentleman recoiled, then walked away abruptly, I then asked myself, " Did I say too much?"