Simple answer: the thread has become a tribal flame war. It's not about the content of your comment, but which side you're on.
That said, negative karma on such comments is usually transient, and for that reason, HN guidelines recommended that you don't complain about downvotes. Such cases typically self-correct after a few hours.
It's coming:
Tesla Is Sued By Drivers Over Alleged False Autopilot, Full Self-Driving Claims [1]
Tesla faces U.S. criminal probe over self-driving claims [2]
California regulator claims Tesla falsely advertised Autopilot, Full Self-Driving [3]
[1] https://www.carandbike.com/news/tesla-is-sued-by-drivers-ove...
[2] https://archive.ph/zceIz
[3] https://archive.ph/7qYSm