I have only formally complained once at my GP surgery.
My meds were stopped, due to a lack of communication from the surgery, when a GP failed to review my controlled drugs and I couldn't understand why the prescription hadn't been written.
I had just come out of hospital after a heart attack and was left with withdrawal symptoms, because the repeat hadn't been prescribed.
I received a formal apology from the Practice Manager.
I certainly wouldn't waste my time and their time, because someone called me 'hun' (I did a touble take, when I read your post. In Glasgow that has a totally derogatory meaning, b.t.w. 😉)
The fact you got the referral you needed after one visit, is a positive outcome. I have been waiting for a referral since Decemeber 2023, when my Cardiologist wrote to my GP, saying I needed one see consultant in a different speciality, the referral still hasn't been done.
You are very fortunate in that the trainee did her job, regardless of her appearance.