Hey, Vlad, sorry to hear man, that's pretty shitty treatment. Everyone I was over at the dealership, I was offered free drinks, and my SA would come talk to me immediately, or would apologize if he was with another customer. Even after I took delivery of my car, I went back once to have my car reset (it was still in shipping mode), and he shadowed me around, I almost felt bad haha, I was like, I don't want to take you away from your busy schedule, I can just browse around while the tech is resetting the computer.
I believe it's up to the individual SA, like David suggested, I would seek out another SA at the dealership, I'm sure if your current SA doesn't seem to want your business, someone else will gladly have you as a customer.
that's my two pennies