They can protest Kamala.....but she wasn't elected President and has never been President.
If you're going to protest anyone, it should be Trump and Biden.
After that, you can protest most of the acting U.S. House & Senate members since many of them have signed bills to throw money at Israel.
There's nothing inherently "wrong" with going at Kamala, but it's kind of like a woman being abused by her husband and instead of cutting his nuts off, she takes out her frustration on her shytty coworkers.
DNC would be idiots to try and push her again. They need a more seasoned version of Mumdani...not a centrist. Racial/gender/LGBTQ stuff will have to take a back seat. Focus on the economy, how our rights have been slowly stripped...basically the shyt that affects EVERYONE (but technically affects Black & Brown the most).