Responses and reactions should be proportionate - if the 'offense' is verbal insults, then the response should be verbal insults, if any.
With all due respect, the question isn't whether people should be free to condemn Ahmadis for their faith or free to condemn anyone who they feel insulted their faith. The argument is over using violence as a response to verbal 'insults' & over theological differences.
As I said earlier, people are free to view Ahmadis as non-Muslim, condemn them, proselytize against them, but using force, whether through mobs or through the State, to coerce them to violate their own faith and to discriminate against them, is unacceptable.