Something I should have learned long, long ago, both regarding giving criticism and receiving it: "Nothing is often a good thing to do and always a good thing to say." (Credit for that goes to Will Durant)
And, as I have figured out over the years, regarding someone's disagreement with you or poor opinion of you: you don't have to win. Declining to fight the battle isn't the same as losing, and it's usually a lot less taxing on the emotions.