Why can't white people dance?

It's a matter of culture, not physiology. It would be better to say why can't people from Germanic cultures dance.

The Spanish certainly have a very strong dance tradition as to the Gaels with their Irish and Scots Step dance.

Check out 'Flamenco' and 'Riverdance' before saying 'White people can't dance.'

In Riverdance 'Lord of the Dance' there is a interesting competitive display of Irish step alongside African - American dance.

It might change your mind about 'white people can't dance'

They can dance, just not in the way that other cultures like.