Where exactly do you think they went?
The Dixie Chicks lost a LOT when they said what was said. A lot of fans, a lot of music sales and a lot of respect. Country music fans tend to be patriotic and the Dixie Chicks stepped all up on the toes of their fan base.
As for the rest of this. The thing about clothing and such is that what the code is referring to is not taking an actual flag and making clothing from it. Not material that is made to look like a flag. Just like I could burn a flag colored shirt and it wouldn't be an issue but I would not burn a flag. A napkin made to look like a flag is not a flag, it's a napkin. But you should not cut up a flag to make napkins from it.
The kneeling is disrespectful, no matter how you turn it, that is their intention. They are protesting oppression. Personally, if they gave up those American dollars they are paid in, I would be a heck of a lot more willing to listen. But no, they are instead protesting a symbol of this country that gives them the opportunities to make those millions every year.
I have an issue when the military is disrespected and whether that was their intention or not, it's what they are doing. The military has fought for their right to protest but sometimes just because you can do something doesn't mean you should. Sometimes you just say thank you to the people who give you that right and move on.