AITA for purposely dressing down to buy an expensive BMW?

TL;DR: Dressed in a t shirt and shorts to buy an M4. Boomer salesman showed no interest and lied to me so I complained to the manager about him.

I was recently promoted to senior software engineer so I figured I would treat myself to a BMW M4 Competition.

The idea of dressing like a hobo and buying a sports car always seemed so cool to me, as lame as it might be. I work from home and I was wearing basketball shorts, a baggy white t-shirt, and crocs. At the door, my GF realized what I was doing and scowled. She asked me to change but I told her they'd be happy to take my money no matter what I wore. She just rolled her eyes but didn't say anything.

At the dealership, there were only 3 salesman on the floor. Two were busy with customers and one was doing something on his computer.

I wanted to ask if they had a test car with the carbon bucket seats option. I approached the boomer-aged guy on his computer. I asked if he had any M model with bucket seats. He glanced up for like half a second and said "what you see is what you get". Ok then.

I found a demo car on the floor with bucket seats. I went back to the boomer and asked if I could take it for a test drive. He told me one of the other salesman could help me out. Okay then.

The other salesman were still busy. I was frustrated but I obliged. I waited by his desk and 2 minutes later he told me they don't allow test drives of M cars. Which is bullshit because I had the option to book it online - I just didn't know if the test car would have bucket seats.

I ended up waiting for one of the other salesman. He was great - he let me test drive an M2 with bucket seats and I ordered the M4 through him. At some point, the general manager came out to greet me. I shared with him that I was disappointed from the customer service I got from boomer salesman. The manager shot him a dirty glare and boomer had a stern but concerned look on his face.

On the way home, I was elated about my purchase but I noticed my girlfriend wasn't as excited. I asked her what was up and she told me it was a dick move to bait boomer salesman into giving me no attention then complaining to the manager about it.

I honestly didn't intend to bait him or make him look bad. I just wanted to dress like a college student while buying an M4. AITA?

Edit: I still have no idea whether or not I'm the asshole. Also I've never seen Pretty Woman. And why does everyone think I'm lying? Leave a RemindMe comment, I'll post a photo of the M4 on r/BMW when I pick it up in September.