I spent a few years as well on the Texas-Mexico border. The relationship between the "English" and "Spanish" congregations is curious. Both groups tend to do their own thing, despite worshipping the same god.
Interesting. Not to argue with you by any means, but I grew up in South Texas also and don't have quite the same viewpoint. The area I lived in had a number of small towns with usually just one English and in some, one Spanish congregation. As a rule, the Spanish cong's were much warmer and more loving than the English, and in most cases, they mixed quite well. I remember playing softball routinely in one town and there were bros/sis from both cong's playing and they knew each other well. I guess because of this there were a large number of interracial marriages between Hispanic and whites with no interference or really even a second thought from the elders or anyone else in the cong.
I know of a cong in north Texas that I went to with a friend of mine and I was surprised because all the blacks sat in the back of the hall and the whites in the front. I asked him about it and he said it was weird when he first moved there, but that it had become 'normal' after a while.
An elderly sister that used to ride to the meetings w/ us used the 'n' word all the time, but it seemed to be a substitute for using the word 'black'. Like she would say "The 'n' - man across the street came over to help me with my truck today." It wasn't like she was trying to be offensive or had anything against black folks, but I guess she just grew up in a time when it was accepted to say things like that.
I guess overall I don't believe that the Witnesses as a whole are racist. I witnessed very few incidents of racial problems during my time in the 'truth'.