Let's see...
Do I care about what other people think of me? Not really. I am pretty secure in who I am, foibles, faults, and arrogance included.
If someone else takes the revenge site seriously (or even looks into them often), do I want to be dating that person? Not really.
How would I know they had posted onto a revenge site? Well, now, that's a kicker. Someone would have to direct me to it. And prove that she was the one who posted it. That sounds like way too much work.
Even assuming all of that were true, how would I know that the comments weren't 100% justified?
Untimately, no, I wouldn't really care. Sure, I might end up there eventually, but I already am intimately familiar with my character faults. And if someone else is going to take that site seriously and decide not to date me, well, so be it.