I don't really understand the argument that the wall is racist.
I think racism was used to create support for the wall, but there obviously can be non-racist reasons for a wall. To this end, the 2,000 mile, beautiful wall was a symbol. It wasn't a rational or thoughtful strategy for reducing the amount of drugs and human trafficking that occurs via concentrated, unfenced, migration routes at the Mexican border. It was meant to symbolize that we were going to keep the brown people from Mexico out, while completely ignoring our other border.
Many of you thoughtful conservatives are interpreting his "wall" talk as being strategic additions to the fencing. I do not see anything racist about that.