"What's wrong with respecting your flag and country ?"
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Nothing.
The point you are missing is that it is every person's right to choose to do that, or not.  It is nobody else's right to force them.  That is what freedom of conscience is about.
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More to the point, you might also have asked: "What's wrong with respecting the US Constitution, and the rule of law"?
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Is it possible that respecting the Constitution is even more important than respecting the flag?
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Freedom of speech and freedom of conscience are the cornerstone principles upon which the US was founded, entrenched in the First Amendment (and in the Charter, 195 years later).  How can you be "respecting" the US as a country by dis-respecting them?
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Every President swears an oath to defend and protect the Constitution of the United States.
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Yet the Orange Clown doesn't seem to have grasped the meaning of that oath and of his duty.
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But LeBron James sure has.
And so has Robert Mueller.