You can bet that if the Left could get away with it, they’d toss the Stars and Stripes out with the Stars and Bars. And for the very same reasons.
The Stars and Bars isn’t the same as the Confederate battle flag. The Stars and Bars was the CSA’s first national flag and it resembled the Stars and Stripes to such a degree that it caused confusion. Later versions of the Confederacy’s national flag had the battle flag in the canton.
The battle flag itself was square. The Confederate Navy Jack is what most people imagine to be the Confederacy’s national flag.