How many people are attending these classes? It's just people taking an interest in foreign culture. Loads of people learn Salsa or speak a foreign language, or learn dishes from foreign cuisines. Look at how many European people do Yoga. It's not a problem to take an interest in a foreign culture or to adapt aspects of which which you find attractive.
The problem comes in when people value the foreign culture in such a way that they undermine their own and spread discord in their own society. Pakistani liberals are a perfect example. In fact they say a picture speaks a thousand words - I saw this on Twitter as a perfect example.
Not a second thought spared to how many Malala's, the drones killed sleeping in their beds.