AITAH for expecting a refund for the "boxers" I ordered?

I've been hearing great things about Lululemon underwear, so I ordered a five pack of boxers. On their site they have options for "boxer briefs" and "boxers". I ordered boxers. Before I did though I even chatted with their Customer chat because the photos of the models look like they're wearing boxer briefs. The rep assured me the boxers were looser and even said "if you don't like them, you can just return them for a refund". OK I thought, what do I have to lose?

So I get them today and throw a pair on. They're boxer briefs as I fear. "OK, this is obnoxious" I think. "Why would they sell these as boxers? They're boxer briefs?"

So I go to set up a return, and of course because they're underwear they don't want them back. But the rep tells me because they're worn, I can't return them. Now... this makes sense to me. I don't want Lululemon selling returned, worn underwear. But A) they're selling boxer briefs as boxers which is just a baffling falsehood and B) the rep assured me I could just return them. I only took the risk because she assured me I could return them.

Am I out of line thinking I should be refunded? Thanks for the sanity check.