After living in New York, I have a Pollyannish belief that if you were inclined to be unconsciously racist...you'd give up that inclination in day-to-day life...or else, how could you cope with the sensory/panic overload? Everyday you're exposed to hundreds, sometimes thousands of people of every ethnicity and religion, just being normal.
[0] https://github.com/unorthodox123/RacialDotMap/blob/master/do...
I don't think that subconscious racism really works like that. I doubt that those types of racists are afraid of other races in that sense; they don't think that their cab driver is carrying a briefcase full of C4 in the trunk. They probably just have negative prejudices against 'em ("they're dumb", "their food smells", "they're just here to steal jobs").
And for every positive and neutral experience, they'd be likely to have a negative one as well - and they'd filter out and ignore the positives, while giving more credence to the negatives.
Leave your apartment, walk past some people that you just know are stupider than you, get a coffee served to you by some guy you just know is less hygienic than you are, when you park your bike make sure you lock it because some of the people nearby have criminal tendencies.
What overload? What panic? Some people carry these attitudes around with them all day, every day, and they don't panic about it.
Also: http://www.dailymail.co.uk/news/article-2298398/FDNY-lieuten...
Abou El Fadl "found it hard to believe that the same God who created such companionable creatures would have his prophet declare them 'unclean', stating that animosity towards dogs "reflected views far more consistent with pre-Islamic Arab customs and attitudes".[32] Furthermore, "he found that a hadith from one of the most trustworthy sources tells how the Prophet himself had prayed in the presence of his playfully cavorting dogs.
(from wiki: http://en.wikipedia.org/wiki/Animals_in_Islam_