At my last graphic design job, my boss (who doesn't know anything about design) would constantly undermine my design decisions for our biggest client and would tell me how to design things, which resulted in our client getting annoyed with me.
One day I decided to go with my gut and design the client’s menus with what I though they wanted –which happened to be COMPLETELY OPPOSITE to what my boss insisted on.
He was furious and made me redesigned it the way he wanted. Luckily, he allowed me send both proofs to the client.
Client: Oh wow, this is night and day. This one, definitely.
They chose mine.
I didn't stay at that job much longer.