Yeah I wouldnt do that.. My cham hates red also. One day I couldnt figure out what he was being so pissy about and then I remembered I was wearing a red shirt lol
Think about it this way...your cham spends almost its entire life in the vivarium, so it should offer whatever makes your cham the most secure and content. It will be its territory, so it needs to feel safe. The rest of your house is yours to do what you want with. Red would be a bad idea.