I think you should look up the definitions of "mutt" and "mongrel". They refer to an animal with an overtly obvious mixture of breeds, for which no certain origin can be ascertained. This is a very weak standard which would permit someone of, say, 3/4 White ancestry merely because he is not obviously of mixed race. Instead of this I added a bright line standard: you must be of European ancestry and must not be of non-European ancestry. This is a much clearer and stronger statement. The fact that you reject it significantly indicts either your credibility or your intelligence.