Calling them out publicly how? For not wanting to spend money on his platform after he endorsed an unambiguously anti-Semitic statement?

In response to a post that claimed Jewish communities support “hatred against whites,” Musk replied “You have said the actual truth.”

He is the one being called out. What’s he gonna say? That Apple hates South Africans?

You're ignoring the fact that he's repeatedly attacked advertisers by name for leaving, for example for "hating free speech" or being "too left-wing", and that conservative influencers have in the past rallied these efforts by calling for boycotts.

You're focusing on whether his attacks would be morally legitimate, which is besides the point (that hasn't stopped Musk in the past). His base would find it convincing, because many on the right refuse to admit that it was antisemitic.