I was really offended by what someone said before class what could I have done or said?

I think addressing them personally, at that time was your only option, since now it's a matter of your word versus theirs. I'm not sure I would have had the guts, at 20 or 22 to say anything but now, at 50, I'd likely say something to the effect of:

Guys, your comments are inappropriate in any context, and if you need to be told why, you are both idiots. Please change the subject or take your discussion out of this room.

I would have turned around and told them to take their conversation somewhere private or not at all because it was offensive and demeaning. I would have told them I couldn't believe that was the highest level of intelligent conversation they could have, especially when they'd been accepted into an institution of higher learning. I also would have said if they keep up public comments like that, they would never gain anyone's respect and women probably wouldn't even consider dating pigs like them.

It is hard to say, not knowing what was said but maybe what you did was the right thing. You had no way of knowing how these individuals would have reacted if you said something to them. The other option you could have used would have been to say something to the professor, preferably in private and let the professor handle it.

Just make a formal report in writing to the college.... That way the college will have them on file if they are serial offenders.

I doubt saying anything to them would have helped.

Saying how you feel--that the behavior of these men is utterly unacceptable--is only going to make you a target. Send an anonymous complaint to your student life department and to security, including the names of these hoodlums.

If that ever happens again, tell them you are offended by that sort of crude vulgar talk and if they continue they will force you to go the principal and report them.

I would have asked them not to use that language around you because you find it offensive.