On the Islamic ruling on Muslims boycotting some products or companies, Dr. Hatem  Al-Haj, a Professor of Fiqh said:

I would personally encourage Muslims to take part in the boycott campaigns when they are called to by trustworthy scholars and organizations. This is a tool that we have and should use, particularly in times where we lack other tools, to demand respect to our values and interests. Every people have the right to transact with whomever they want.

This, however, is a temporary measure that may be used for a particular cause, and once the cause is fulfilled, normalcy should be resumed.