not specifically when taken out of context, but definitely, it CAN be meant to mean something very particular.
If the statement "what a surprise" is (as is probable) made ironically or sarcastically, it would tend to mean that the favoring of white things was already completely obvious to all. There are many possible reasons that could be. It could even be that the guy is an obviously racist bigot and white would, of course, be his favorite color, but it could also mean that the person is always wearing white and most things he owns are white-dominated, so saying white is his favorite color is screamed every moment of his life by the things he wears and owns.
So of course, it likely does indicate "something". the question is simply what. The statement likely would not have been made in the first place if it did not indicate "something". People tend to say words that mean something, when they say them, even the empty words of greeting.