Do you think it's okay that I'm going to display a Confederate battle flag in my private office?
Are you serious? Why would you display a confederate battle flag in your office?
I'm proud of the flag.
You might scare away clients or make them think you're racist. That's probably not a good idea.
I don't like the military situation of the US and want to show my disagreement with it.
Well, you have freedom of choice and speech, so if you think that's good for you, then I will support your decision even though I think it might be too much for other people to bear. I'm willing to bet that if they see you have that flag up, you won't have a single black client. It's a risky move, and I applaud your courage.