I woulld consider it a non issue. The fact of the matter is, regardless of belt color, a person knows what they know and can do what they do. No color could ever take that away. My advice for you is to go to the wushu school. I say this, so that you can be exposed tonew things,and because though you love muay Thai, from your post it doesnt sound like you have been training it on your own in your down time, so perhaps you have been looking for something else for some time.
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"When I let Go of who I am, I become who I might be."
Lao Tzu