If I don't want to buy a Musk-mobile because I don't agree with Musk on issues like racism[0] or don't like how he treats his employees[1], I am allowed to act on it. I am also allowed to share these thoughts with people on appropriate platforms, like I'm doing here.
I can understand the frustration coming from people digging up problematic tweets from 4 years ago, but this whole idea that "the internet forgets nothing" isn't new. I learned it in grade school. If you want to post racist/sexist/homophobic things on your public Twitter, so be it, but don't be surprised when someone finds it. There's also a delete button.
[0] https://www.theverge.com/2018/11/30/18119832/tesla-elon-musk...
[1] https://www.ibtimes.com/elon-musk-hot-water-after-tesla-empl...