Well I sayyyyy...

I was at a bazaar recently and I was nice enough to allow customers to try on the clothing before purchasing.

But I BELIEVE that I have my right to refuse anyone from trying on my clothes, even if they're a prospective customer. Based on reasons within reason of course. Don't you think so too?

There was a girl, really overweight, and who believes that she's the hottest thing on the planet.
Why do I say so?
Cos she walks like she's a model, talks in a very fake Brit-American accent and swings her fake LV bag around. (hello, it's not that hard to tell between a real LV to a fake one). Her tattooed shoulders (yes omg she was wearing a halter top with her fats bursting out everywhere) even reads 'hot stuff'. WTF, how tacky.
That was my impression of her, but I was nice and all smiles when she and her mousey friend stopped by my stall.

She picked a particular dress, which was 3 times smaller than her.
The material was stretchy but I doubt it was stretchy enough to fit her, seriously. And she held it, looked at it like it was love at first sight and asked me, "ini boleh try ke?" [Can this be tried on?]

I was like, "Boleh try, tapi.. err.. No offense la but I think this dress can accomodate sizes S-M only. The material is not that stretchy."

She spoke with her fake brit-american accent,"Oh, nonsense. I think it can fit me perfectly fine. After all, a size L is only slightly larger than an M size. I want to try."

If anyone had seen her, she's definitely a size XXL.

Me: Umm, sorry miss but I don't want to risk my dress being damaged. I really don't think it can accomodate you as it has a small cutting.

Her: Hey, how you know? I never try it on yet, how can you tell?

Me: So if by any chance IF the dress gets damaged like ripped or torn, then how?

Her: Hello, you're in the fashion business, don't you have a sort of back-up plan to cover damage costs?

Me: No, I don't. I buy and I sell, that's about it.

Her: That's wrong. Let me tell you, as a business major from the UK,  you cannot start a business without any back-up. Like what if your shop burned down or something and destroys your clothes? You need the insurance to cover that.

Me: [WTF] My shop's online by the way. And if my clothes got destroyed in a fire, I'll bear the cost myself. And right now, as my own way of ensuring I don't need to make any losses, I'm not allowing you to try this dress on.

She then went on a bout how unprofessional I am and yadayada, then left with her mousey friend. How rude!
I'm no business major and I don't have much knowledge on that, but I don't think I even need that sort of insurance as a part time blogshop-owner. Am I right?

Can someone clarify this with me please? Thanks.