Nyah, the phrase was to reference the size of her balls. Most folks go for elephant balls or brass balls, she went for ape-balls. Maybe it's racism, maybe it's not. I don't think it's conclusive.
Same with her explanation for Planet of the Apes reference. She never said the woman looked like an ape, she never said the woman was like an ape, so folks inferred it. I don't think it's conclusive.
But yeah, as Orbitus says above, she has a long history of unhinged behavior and has posted many conspiracy theories. A tweet saying Jarret was in league with Iran to bring sharia law to the world and oppress everybody really seems more in her wheelhouse than a random racist post over the course of 20+ years in the public eye advancing all sorts of progressive stuff.
So she is unhinged, she should not have gotten a reboot simply because of her prior posting habits, but that's probably what they were looking for when they cranked up the show. Firing her for racism feels wrong, firing her because what she says reflects poorly on your company is fine, IMO. Maybe she's racist, maybe she's not. She doesn't need to be racist to be fired, the statement doesn't have to be racist to get her fired.
It really just seems like they rebooted the show because they got Roseanne, then were surprised they got Roseanne.