It's purely because of his politics. Everyone loved Teslas before he moved to the right.
He's always been a piece of shit, it's just that the last several years he's been a far more obvious piece of shit.
[0] https://electrek.co/2020/10/06/tesla-dissolves-pr-department...
Long before he announced he intended to vote Republican in 2022.
If by "moved to the right" you mean "he fell off the far end and if he were a politician his politics would be considered radical extremism", sure.