you are wrong...even with freedom of association upheld as a key part of the first amendment, discrimination based on race, gender, age (and more) is simply not allowed.
"Laws prohibiting hate speech are unconstitutional in the United States, outside of obscenity, defamation, incitement to riot, and fighting words."
Which means if I say "women are all stupid" I should be able to avoid getting sued because of the 1st amendment.
If, however, I decline a job position because someone is female, and she or someone else will be able to _prove it in the fucking court_, then I will be guilty of violating the law in your link.
Do you or do you not see the difference between saying "man, I'd really like to punch someone right now", "I would like to punch >you< in the head", and actually punching somebody in the head?
First is just a general statement, second is a threat, third is violence.
Again, if I say "I don't want to hire women" and then go ahead and employ a woman just because I need an employee and she's qualified, I'm fine in terms of the law. It's similar to me saying "hey, I'd really wish I could rob a bank right now" and then obediently following the law and not robbing a bank.
Please do not step on my freedom of speech in the future.
Section 1981 of Title 42 of the United States Codes (http://www.law.cornell.edu/uscode/42/1981.html) which protect people from being discriminated against has been upheld.