$100k does not go very far in San Francisco and Manhattan. Nobody making $100k in those places could reasonably afford a Tesla without severe over-spending (which they're welcome to do if they want to--whatever floats your boat). If you view the middle class as owning detached single family homes with yards, you would be lower middle class at best in those cities at $100k. If your spouse also made $100k, you could afford the crappiest single family home that was still livable.
But it's a really good salary in Denver or Houston; you could definitely find a nice house to buy and afford comfortably, though it might have a bit of a commute. If your spouse also made $100k, you could afford a nice home in any neighborhood with no commute.
And it might nearly qualify you as wealthy in a small rural town of 15k people total, where you would never need to spend more than $150k on any house.