As you must know, that is not the flag of the Confederate States. It is the battle flag of Northern Virginia.
This is the Stars and Bars
https://www.dailymail.co.uk/news/article-8596171/High-school-cheerleaders-posed-T-shirt-saying-love-Redneck-Boys-Confederate-flag.html
Both the daughter and the mother are ignorant of southern history. The cheerleaders probably are too.
High school history classes don’t teach about the thousands of blacks who were slave owners.
oops, wrong link
This is the Stars and Bars
https://en.wikipedia.org/wiki/Flags_of_the_Confederate_States_of_America#/media/File:Flag_of_the_Confederate_States_of_America_(March_1861_–_May_1861).svg
.svg){kind=link}