I've only gotten feedback once, at a goodwill. I used a birthday coupon or some such discount and when I refused to "donate" any amount to whatever charity, she

I've only gotten feedback once, at a goodwill. I used a birthday coupon or some such discount and when I refused to "donate" any amount to whatever charity, she said under her breath that since I got the discount I should at least donate. Since it was under her breath, and since these workers are generally ill treated and underpaid (quite literally less than minimum wage) anyway, I decided not to make a scene, but I very much felt insulted that they would want me to donate to a charity after they just sold me a product they received for free.