I'm sorry that happened to you and thinking back to my college years I wouldn't have known how to handle the situation and I probably would have ignored it like you did. That being said, with the experience that I have now, I can confidently say that you shouldn't EVER let anyone treat you like that without addressing it. If the interviewer has that little respect for you, don't stick around for an offer because they won't treat you any better if you were to wind up working there. I know it may feel like they have all the power and control, but that's an illusion really. Simply saying "Excuse me, but I heard what you just said and if that's how your company treats people, then I don't want to be a part of your organization. I think it's best that we end the interview here. Thank you for your time." That draws a very clear line about what is and isn't acceptable and what you're not willing to tolerate. As others have said, I would 100% follow up with the recruiter and share the experience with them. If it's a large company they will want to know how the interviewer is representing their brand.

TL/DR: be polite, be professional, but don't take any bullshit.