The real trouble starts when you’ve fallen in love with an idea and had it rejected. You feel you’re being treated unfairly, that your genius is tragically unrecognized and your boss is a hack.
All this may be true. There are some ideas worth fighting for, and this may be one of them. But don’t do it now. Now, listen to the input you’ve received and solve the problem on the terms you’ve been given. Your anger is beside the point right now. Once you’ve proven that you’re a trouper by returning with thinking that follows the input, you can bring up your original idea again. It may get a better hearing the second time.
Then again, it may have been a dud all along. Or, most likely, you’ll have forgotten all about it, because now you’re onto something better. Try it and see.