When you have a 'bully pulpit' as powerful and far reaching as Facebook now provides to the president then it is totally reasonable to want to hold them accountable (given you disagree with their stance).
I don't exactly understand what is objectionable about protesting the decision making of corporate entities given the immense power they hold?
This is like saying you shouldn't boycott BP for their oil spill, you should just complain to your congressperson. I don't understand why you can't complain on both fronts?
That's something you take up at the ballot box or with your Congressperson/governer, not Facebook.