Baseball players grab their crotch and spit on the ground all the time. She is not known for her singing. She is a comic and that is what she did.
Here’s the actual video of Barr ‘singing’ the National Anthem. I’m guessing you hadn’t seen it.
https://m.youtube.com/watch?v=ls1YVhcLD2c
...now combine that ‘performance’ with her hardcore communist positions and afliations that I just reposted above and tell me again you don’t believe she was deliberately disrespecting the song and the country.