I just don't understand

[Anonymous <no_email@fake.address>]

I am 25 years old and have been working for my
current employer for 10 months. I am an associate editor 
at a trade publication for the cotton industry.
I changed jobs just last year after working for a 
company whose owner was not only sexually harassing each
of the women he hired, but also mentally tormenting 
me because of my "outgoing" personality, meaning I voiced 
protests. Anyway, I came to this new company very glad
to be gone from there. I had only been in the office
for one week when I was faced with an overwhelming
racist and sexist display from the men I worked with.
Both the senior editor and saleman spoke constantly
about their hatred of blacks and disdain for females.
This display concerned me very much and I was faced 
with very obvious sexist attitudes almost from 
the beginning, even more flagrant than those of my 
previous employer. It did bother me very much, to the 
point of thinking I might have to leave the company. 
But the salesman ended up leaving only a short time after 
I began. I felt better. But his "buddy" who had been 
the quieter of the two took his place and began consistently
bashing blacks and women.
I listened to this for about three months until one day
after he began his tyrade on blacks, nearly a daily occurence,
I finally told him I had enough of his slurs and that
they were inappropriate and offensive (I'm not black).
A coworker witnessed our encounter. Once I told him to
stop, it made him more angry. while I went to my desk 
thinking it had ended. He kept coming back to me insulting
me even more with his disgusting views and told him
he was insane for not letting this go especially after 
I told him he was offending me. At one point he came and 
threw an article that favored racism on my desk and then 
threatened me by saying that he and his friend had "trucked"
the woman I had replaced out of the company and he would 
do the same to me. She had in fact quit, but I had become
aware that she had lodged complaints with the human resources
department on him and the former saleman, apparently to no 
avail. She was a lesbian, I am not. 
That day I gained my composure and left the office for 
lunch, thinking the incident would be over. For the next
week, his actions became more offensive with comments about 
women etc. He would not talk to me regarding our work 
together and was very hostile. After a week of this, I went 
to our supervisor and informed him about what had happened
and asked that he talk to the two men in office regarding their
discussing such issues at work.