I agree this can be a form of abandonment. With a person who you have an equal and understanding relationship with, there can be room for healthy discussion or debate re: a difference of opinion. It can still sting and get out of hand, of course, but there isn’t as much of a power imbalance (theoretically). But when it’s someone like a therapist or an “unequal/one-sided” figure, and they just shut you down without explanation or context, it can definitely bring on a kind of emotional isolation that makes it harder to open up the next time around.