While I don't technically have a design background, I recently wrote up a little something for the folks at The Layout about what to do when a client says they don't like your work. And while there are glimmers of designer-specific advice sprinkled it, much of the post drew from experience I've had working as a freelance and contract writer.
The best advice I've got? Get over yourself.
Want to know more? Read the full post on The Layout: "How to respond to I don't like it."