Do you wanna sing the song? then SING it! If not,then, DON'T SING IT! But Respect it, as it's a National Song and it has got lotsa stories to tell about the history!
I still believe in the freedom of speech and expression. By the way I'm an Indian and I don't have any problem with what you do or think about it; just my opinion..

---If you can't CONVINCE 'em, CONFUSE 'em!!!