I sew a lot and get whatever I can from the only fabric shop in town. Two weeks ago I chose some buttons for a shirt I'd made. Shopkeeper watched me put one button on the shirt to see if it was right. I counted out the extra ones I needed from the tube on the counter, put all six together, said I'd take them. 'What about the one in your hand?' I showed her my empty hands and she smiled and shrugged. I went again today with my DMC embroidery silks (which she doesn't sell) to match to fabric. When she'd measured what I wanted, she pointed to my DMC silks, said, 'Are they yours or ours?' There were two other customers at the counter who made a great show of not listening. I told her she'd called me a thief before but she won't do it again. I'd intended to buy an overlocker (£250) and told her that, too, saying I shan't bother now. She tried to make a joke of it, saying she hadn't meant anything.
As I was going out of the shop, I heard her say to the other women, 'Well you can't be too careful, can you, with some people.' AIBU to find this totally insulting?