Musk was a darling of the left like 2 years ago. The media created this hatred campaign against him as soon as he said he wanted to buy Twitter and expose their manipulations, coverups, and so on. It has nothing to do with him waving his arm in a manner that doesn't look anything like a Nazi salute unless you're looking for one. (Every public figure has some photo of them waving from some weird angle that makes it look like a Nazi salute, and Musk's wave looks even less like one than that.)

As for being racist, lol is all that can be said. Where is the same backlash against the numerous companies and institutions that explicitly and openly hired people based on race and other criteria for years? Nowhere, because they don't threaten the establishment media.