I believe that excessive humility goes against good criticism of a person. Very often this happens because of teachers who do not encourage students to do more and who deprive them of proper recognition, perhaps believing that in this way the student will feel spurred to do better. I believe it depends a lot on people's characters and it is always wrong to "generalize" when acting upon the strings of a person's soul.
I come from a similar background, where I was praised little and criticized much. It is welcome if the criticism is constructive; it is bad if the criticism is destructive.
If I find myself studying something with a fixed time limit available, it is one thing to tell me what is wrong and help me overcome the obstacle, but it is quite another to tell me, "you will not be able to do what you are doing within the pre-established time," with the erroneous purpose of spurring me on. At least for me, this is absolutely demotivating. I get nervous and tend to give up.
Only with age have I begun to understand that very often we must be the ones to focus on the finish line, observe it, and start running to get there, without caring about the judgments of other people who often, too often, open their mouths and keep talking only out of a sense of omnipotence or envy.
In your case, you seem like an excellent pianist, but one who is still too tied to verbal "oppression," from which you should shield yourself and not care. Keep the music for yourself and leave the criticism to others!
