I don't have good answers for you, but discrimination isn't always done intentionally. Maybe more often than not it's ignorance or simply institutional. I am also a white male. It took a long time for me to figure out my own biases and honestly I am still learning about them. I recommend this movie:

http://www.imdb.com/title/tt0484384/ (The Color of Fear)

There are pieces of it on YouTube apparently:

https://www.youtube.com/watch?v=2nmhAJYxFT4

I once decided to investigate racism more. In addition to reading academic materials I also tried reading magazines intended for black women and found a section on how not to scare your white boss with your hair. There was all kinds of stuff like that, and it was both shocking and depressing. I just had no idea.