Egos do not belong in the editing process. Ever.
If you are editing your own work, the process is cold and calculating. You (and I) must be willing to sacrifice every sacred word on the altar. If we as writers didn't make the baby bleed, we've failed in our jobs. The most important thing the author can do is to make the reader forget that the writer exists. Your ego (and mine) must die for the story to live.
The same goes for editing the work of others. Your ego (and mine) have nothing to do with the refining of someone's story. Again, it is a cold process, more analytical than creative. Treat it like a mathematical equation, and leave your heart and personal preferences out of it.
I have met two types of writers in the world: those that sacrifice to learn the trade and those that refuse to learn from anyone. I've come to the conclusion that the submission process to find a publisher is designed to weed out those that are unwilling to submit to the learning process. After all, if you can't write a query letter to industry standards, how are you going to write a quality manuscript?
Recently, I was involved in a group anthology. I submitted a 5K story. It took me a week to write and a week to edit before I sent it out. Then I humbled myself to listen to the critiques of my editors. I had four people read it, two of which felt there were major plot holes, and I had to go back and beef up the story.
Then it went through another round of edits for word tweaking. I didn't fight my editors. I let them tear me apart, and I listened and learned from their advice.
As a dear friend said, if you want to be a writer, "Pay your dues!"