AIBU to think my dentist was unprofessional about another patient's appearance?

[SpringDreams26]

Went to the dentist today. She is approx 45-50, I’ve been seeing her a few years. When I went in told me she was having a hot flush and I sympathised with her, I’m always happy to talk about women troubles.

Then she told me about her skin care etc, went down a bit of a rabbit hole about her routine etc. Then she said her saw a client last week, who she’d treated for years who told her she didn’t like “taking stuff” which she meant collagen, B12 injections etc. She told me it showed because she had really aged.

AIBU to think shes a bit of a twat? I felt it was extremely unprofessional to comment on another clients aging. She’s a dentist! I don’t consider us friends and obviously said very little with her fingers in my mouth.

For the record - I would like to change dentist, but they all have waiting lists.

I used to have a very friendly and chatty dentist who had some well known patients (media) and could be hilariously indiscreet about them. And he was quite well known too.
Luckily I am not at all known and hence not worth gossiping about. I was a bit concerned but it was how he was, IYSWIM. He was like that with everyone.
After a while I moved away and left his practice.
(He wasn’t commenting on the state of their teeth, to be fair! )