Why do we clap our hand my boy will shout n cry?

My son also! Since he was 15mths old, whenever we watch funny videos and lol or have a celebration and clap loudly, his face will panic. He will shout and cry. I also don't know why. Now he's 5, also same. He will tell us these to quiet us down: "Why mama?" "Why u laugh? Cannot laugh. Its not funny." "Not so loud, I have headache. " lol. we still don't know why.