Nobody deserves to be fired without communication, without HR being able to confirm if they work at the company, and then proceed to be publicly mocked on Twitter for their physical disability.
Speculating about the person's work at Twitter is beside the point. Thousands of Twitter employees have been let go, but mocking someone for their physical disability on the internet is something else entirely.
The perspective warp that happens in these comment threads is baffling. If someone posted the same scenario (getting fired without communication, then their CEO mocked their disability on Twitter) as an "Ask HN" thread, everyone would have their pitchforks out. Replace unknown CEO with Elon Musk, and suddenly commenters are doing mental gymnastics to ignore the real bad behavior and try to justify something else using speculation.