This country was founded on dissent and will continue to thrive because there are those who do.
When James Otis resigned his position as the Advocate General of Massachusetts in 1761 he did so knowing that he would be hurt financially. He believed that the use of generalized search warrants by British officials ran counter to the long held beliefs that British citizens were entitled to protection from unbridled government intrusion in their lives. When he resigned, he forfeited the financial interest in a percentage of the value of all goods seized with these writs of assistance. John Adams believed Otis' actions were the spark that lit the slow burning fire of the independence movement.
Embedded in the rights Americans hold dear is the freedom of speech, which like all other Constitutional protections is not an absolute right. Freedom of speech is one of the rights championed in Federalist Essay 10 by James Madison who cautioned against the tyranny of the majority, saying that a minority (read small percentage, not race) voice could be drowned out by being overwhelmed by many louder voices.
Often, that smaller group has something of great significance to convey. Sometimes that lone voice is the one that needs to be heard and those in positions of power want the dissenter silenced. How many in our government would have silenced people like Martin Luther King, Mary Beth Tinker , Senator Margaret Chase Smith ? When the Alien and Sedition Acts were enacted, it was the same James Madison who led the charge against the government's ability to silence dissent when he and Thomas Jefferson worked in tandem to nullify these limits to freedom of speech.
If we allow speech to be silenced because we don't agree with the message the dissenter presents, none of us may have the right to speak our conscience in a public forum. While some view the actions of professional athletes as spoiled and hollow, their ability to express an opinion ought not to be limited. I certainly would not want most people to be the arbiter of whether or not my speech or beliefs are acceptable to them and whether or not I have a right to express those ideas.
The rights in the Constitution only limit the power of the government. Through this limit, all of us have the ability to speak our minds about this movement. If the dissent toward the Star Spangled Banner is so distasteful, move to action. Stop supporting the organization that allows the egregious. If the offense presented is genuine, tell the organization in a manner that is unmistakable. Stop watching. Stop attending. Stop buying licensed merchandise. Unfortunately, for too many people, football is more important than what they claim to be their beliefs.
It is easy to claim outrage about the actions of those who kneel, raise a fist, or offer some other symbolic protest. Those who are protesting have more courage than many who claim the actions are disrespectful to the flag, the country, or individuals. The complainers frequently do nothing productive to effect change. Perhaps it's because complaining is easy and actions take effort and sometimes cause discomfort.
If you are truly upset, do something to show it other than using words that are just as hollow as taking a knee.