My motto in life is "Think Crazy. Prove Yourself Wrong." Listening to the tape is a reality check and a chance to improve. "Ouch, yeah that sounded rude when I hear it back like that."
It's not about beating yourself up, it's about giving yourself a new challenge.
A long, long (long) time ago I did Toastmasters, a group dedicated to teaching public speaking in a safe environment for anyone from anxiety-ridden noob to someone with experience speaking who just wants constructive feedback (like the tape) to get over a hurdle.
After recently being confirmed autistic, I started recommending Toastmasters to other autistics as a structured safe place to learn how to present ourselves with confidence. (And avoid the aspie-blurts that I'm famous for.)
Whether a comedian or a worker at a cash register, it's good to be able to deal confidently and communicate with other people.