Compare and contrast major arguments against racial and sexual discrimination?

These are not difficult topics to argue against, as
discrimination in any form of business, housing or banking is illegal and has been for
quite some time.  So my first argument would be that it is often against the
law.

My second argument would be that the majority of
society does not approve of discrimination based on race or gender, and the words racist
and sexist are considered serious accusations, both legally and
otherwise.

My third argument would be the affect it has on
both parties.  Obviously to be discriminated against is dehumanizing, discouraging and
frustrating. It denies someone their humanity, but it also affects those who
discriminate, as it traps them in a permanent cycle of hate or superiority/inferiority
which isolates them from large segments of the population.  This hurts them
too.

Since you're only calling for arguments against, there
isn't a lot to compare or contrast.