These players and coaches certainly have the right to protest in this manner. 
And I certainly have the right to chose whether to watch football or not. 
Personally I've got better things to do than watch a bunch of sissies run around a 50 x 100 field.
Some think protest is about Trump now. But it is not. What it is,  is a disrespect for those in the past and present who have endured tremendous sacrifice to protect the right to protest in the first place. So this behavior shows an utter lack of respect. And IMO it is disgraceful.