They would relegate themselves to the sex only zone

It kind of depends on what they are saying. If they are bashing them all the time, I'd rather they not. (Also, red flag! If they talk thst way about some one else there is a good chance they will talk to me in the same manner. If they just are just stories or anecdotes I'm good with that.

Totally depends. Could be 100% okay or not, whether it's talking about them all the time or never, based on what they say and how they say it.

Whatever it ends up being, it's vitally informative. I should have run for the hills after how much and what my ex said about his ex-wife in the first three weeks of our dating. I thought it was okay because of the way he was comparing me (effusively positively) to his ex. I didn't pay enough attention to the fact that he was constantly running down his wife of 20+ years and the mother of his children. sigh Lesson learned...

I don't mind hearing about ex's. As as they left their baggage behind, like I have left mind behind. Most part women don't like hearing about mens ex's. Even though they pretend to nod they are OK with it.

As far as I remember its never happened to me but I am getting old and forgetful.

I voted other. I don't think it is appropriate for a first date but when you get to the point of discussing your relationship histories it is necessary. After that, in small doses is ok.

If someone has shared custody of minor children, then you are getting into a relationship with all of them including the ex and their partner...

Depends on the situation and for how much really , everyone has a past and to try and deny it is being unreasonable