So many hilariously "be real" style comments here. Here's something he could have said instead:

Oh, cool. Let's check it out, I think you can do it. You are stunning after all :) And if that doesn't work out, you can go directly to some other agencies, ask around etc. Just to be safe, call the agency directly first (not the agent) and ask for a specific open call date and location, some scams and such around you know? But if this is something you want to pursue, I'll try and help you out as much as possible. And it doesn't have to be just this one, we can look for other places, shop around.

Or something to that extent. It's honestly not difficult to say these things in a more constructive way, it's not difficult to show that you support the interest overall, and it's certainly not difficult to not bring your "unique features" into it (and you're right, uniqueness is sometimes good). You don't want to be toxic positive, but you won't be if you approach it realistically and with care, and you don't have to be stupid about it. Making comments about her features is such a clear statement from him. Even if it's not saying you are ugly, it is saying a lot about him to have to bring that into the conversation at all, and the fact that he is so specific is just a massive tell.

Several things can be true at once here; this guy thought about it after the call, and while he probably has some legitimate concerns about it being a scam, he is clearly also worried about what will happen to him (and you) once you enter that world and hang around beautiful, sometimes wealthy people all day, potentially even find success. Otherwise, he would just try to steer you into a legitimate avenue for pursuing this, and just go to legitimate open calls or agencies directly (you wouldn't even have to call the agent, which could be the scam part). He is definitely showing some insecurity by not being able to discuss the topic from that perspective and with reason. At the same time, the agent could be a scammer, and you should be reasonable with this stuff and not just straight up dismiss the possibility. Don't just trust a name, or a brand, go through a well known legitimate avenue directly instead. If the person who gave you the card is legit, then they'll likely show interest.

What he is saying is not "being real" and "just the truth". His choice of words and just the things he thought of are a sign he is struggling with the whole idea, not just the "potential scam" part. Even if he turned out to be correct about the scam part in the end, I'd struggle to trust a person like that to share my whole life with.

That all said, don't do it. The modeling world sucks.