Yes; if that happened in a foreign country, like the Tamil Nation in the south, there would be instant vigilante justice for the color sprayer. This happened to Chelsea Clinton when she visited India with her parents. Her dislike of India and everything Indian started with that fear of going out of her room on Holi day. Here is one defence you may use. Compliment the host "....it is soooOOoo good; but I am full right now. Can I take it home ?" They will be scurrying around to look for a suitable non-return plasticware to pack it for you. Once it leaves their house, you are free to do whatever with it.