I'm a cis het white guy, so luckily I didn't have to suffer any abuse. The "worst" was just not getting a reply. ¯\(ツ)/¯
The worst date I went on was with this girl in a wheelchair. I knew her before from kinky events and was fascinated by her artistic and kinky mind and how she combined that with her disability. So I was pleasantly surprised when we matched so we decided to go on a date in a bondage club.
Tying someone up or getting tied up is usually a quick and easy way to find what chemistry exists between two people. For us it was none. Absolutely nothing. I felt nothing and she probably as well because she was mostly on her phone when we weren't tying.
We are still on friendly terms. But I think I'm pretty lucky that this is the worst I can come up with.

When we got kids my wife and I couldn't find the time anymore to engage in kinky activities with each other. So she started looking on a BDSM site for extramarital partners. I wasn't that interested in the beginning so I didn't do the same.
But after she told me about some of her adventures (and also all the idiots who messaged her), I got curious and created an account without her knowledge. Created a silly Lego figurine as my avatar. And as my first order of business decided to hit up my wife.
All it took was one message to get her hooked. Always nice to get your rizz confirmed. Especially with the person you love the most.