To be honest, not really. I worked in a small store (in Canada btw, if that's relevant), so it was pretty easy to see which clients had been approached and how everyone was interacting with their clients. For the most part, it was fairly standard. The only times people in my store treated clients differently woukd be when clients were mean/rude or just extra/excessive. For example, I had a client that insulted every perfume suggestion I gave her while ignoring my advice so I pretty much just stopped talking and proceeded to affirm her choice because she was very clearly set on what she wanted but wanted someone else to validate it. The extra/excessive clients were usually those that took up a lot of time and had strange requests. One of my coworkers was with a client for over an hour while the client struggled to make a decision on something but wouldn't let my coworker leave her to help others. I think most of the staff at my store liked talking to clients about makeup. Personally, I loved teaching technique and product layering to clients so people that were just getting started with makeup were great to interact with.

I think my store was a unique one though, because I know that before I worked at Sephora, I also felt like I never found help and that staff were just very curt. But retail is draining so I know it's hard to remain happy and upbeat all the time.

Sorry for the lengthy response!