If I had a bad experience (never been a concern so far, knock on wood) that I don't feel I was responsible for I'd write something tactful and to-the-point here, no problem. The issue is that bc there's no guardrails for what people write (despite the many pinned posts), many of these negative reviews are unnecessarily rude and based off mismatched client expectations instead of an objectively 'bad' experience provided. And so so many of them turn out to be client-side problems (hygiene, often, but also timing, too much/little communication, boundary-pushing, etc) once we dig a little deeper. Those reviews are effectively worthless BUT they're on the provider thread now and since they force everyone to post under 1 provider thread at at time here, they're there pretty much forever. If the provider doesn't frequent this site, it's even worse bc then there's no other side.
For what it's worth, I think the OP would be in the right to say whatever they want as long as they explained why they felt that way. Saying someone is rude is useless to me. Saying "this provider was very curt in texts and I hoped she would've warmed up in person but despite my best efforts it still felt like she wasn't having it" is closer to being helpful. The hickey thing is more cut-and-dry, especially if you discussed boundaries to start, and is something many partnered dudes would like to know (even if it's to make it clear they don't want them).