“I have decided that is not worth my time trying to share what I already have and you guys don't have, and I have decided it will be more worth my time to simply and completely monopolise the fruits of my labour unless or until someone re-invents the unique and highly powerful wheel I have crafted on my own without any help or guidance.”

You're obviously free to do that though work is made better through a healthy critique. However, since you seem to have made up your mind, this post is more for those finding the critique stage of creation difficult.

You should never take a critique personally. Granted, some are not very good at it but most people (here in particular) want to figure out how the work can be better. If you present work for critique you can't also present it as a finished product. The entire purpose of a critique is to figure out IF this work is close to done and if not what needs to happen in order to achieve it's goal.

In art school we had to put up our work every week on the wall. Every instructor had a variation of the following guide for the class when giving a critique of their fellow classmate's work:

1. Does it address the stated problem/goal? How? Be specific.
2. What elements of the work are successful and which are not? Why?
3. How well has the piece been technically executed? What if anything can be improved?
4. Critique the work not the student.

There's also advice instructors give for the student who's work is being critiqued:

1. Listen carefully and take notes.
2. The critique is of the work NOT YOU.

Sometimes critiques can reflect the person's biases more than anything they are viewing. There is nothing that can be done about that as most people don't even realize they are doing it. Sometimes you want to hear their biases (an example would be UI testing). Experience will help separate unhelpful biases from constructive criticism.