Well, where to start. I'm going to focus on a few of your words. All of the above statements are way out of line.
Have you ever heard the saying the only stupid question is the one you didn't ask? You will find, if you graduate, that asking for help is essential in this line of work. Not just in the beginning. I agree there are aspects to this particular case that are lacking.
I hope you're prepared for the same subjective criticism as you get closer to your graduation date.
As for the no shame, there is NO shame in asking. There is, however, shame in continuing in a situation you know needs corrected without asking.
PDN nursing is a challenge for a lot of reasons that I won't get into here. I've only been a nurse for six years and the last three were PDN. I was privileged to work in office practice/clinical research and SNF. There is so much I need to learn and believe me when I say mine is the first hand up when I need help in any given situation.