So, a symbol that you love deeply and consider sacred has been hijacked by hate.
Well, I know how you feel; the same thing happened to us.
Based on our experience, I'd like to tender a few recommendations.
Lay down the battle. You've already lost. Regardless of what it may or may not mean to you, to others it means hate. Fair or not, to defend it in public now only taints you by association.
Lay off the public display. Honestly, other people find it offensive. Keep it for use in private, where people know what it means—and what it doesn't.
Choose something else for public display. Do your research. You really do have other options here. Inform yourself.
Be patient. If your values are true, time will not diminish them. It may not happen in a lifetime, or two, or three. What is truly sacred cannot be fouled forever.