For context, this is something that sometimes happens on dating apps. Or at least I've seen it happening more and more. The interaction goes as follows: 

I (a girl) match with a guy. We send each other some superficial getting-to-know-you messages. At some point into the conversation, he asks me how I weigh or some derivation thereof. And then I get pissed, chew them out, and unmatch. 

I'm wondering if I'm transformed into an asshole, because the truth is I can't really put a finger on why I take this question so amiss. We are, after all, interested in each other's looks and are sizing each other in a very superficial manner. And I guess it's relevant for some guys, if they feel that my pics don't provide sufficient evidence of my body type or something. Nor am I particularly self-conscious about it.

*But*. I still find it invasive and offensive every time. And then I retaliate by telling him that's a rude thing to ask someone. But if I get two seconds to think about it, turns out I'm actually not sure. Entirely emotional on my part. In the spirit of growth - AITA?