If it's _________ is unsafe to everyone because________. Then that's one thing, and it's important, respected and helpful. Stick to facts as much as possible.

But if it's just professional venting-

Then for the purposes of this, I'll assume it's from a public facing account that ties to your profession.

Anger rarely serves the purpose you intend. If you want to vent in public, make it humorous, maybe do a video series on stupid things clients do (obviously don't use client names or likenesses because there will be shame associated with it). It would probably be even funnier if you cross dressed while you demonstrated the stupid mistake. Not an actor? Keep a list of "actual things clients have said to me on whatever medium you use." You can still vent, while educating, not scaring people off, and still get your message through.

Still angry? Call a friend.  

And usually don't call the client out unless you felt unsafe. We've all had minor conflicts in our lives and you don't want potential clients concerned on if a protocall breach will cause them to have a significant negative consequences, especially if they aren't especially versed in the uniqueness of protocall in this industry to begin with, or have social difficulties in the first place.