DP and I went to one of these ninja warrior venues; their policy (which we knew beforehand) is a compulsory pair of special socks. We took ones that are identical, other than branding, from when we went to a trampoline park. We were told these weren't suitable and that we had to purchase their own. I challenged this, putting our socks and theirs side by side and demonstrating their similarities. I said I completely understood the need from a H&S perspective needing grippy socks, but that was unreasonable to make us pay for ones that served no additional benefit over ones we were supplying ourselves.
WIBU?