Has anyone listened to the full context of the show (or just the first 9 minutes of it, when they are arguing against the "received wisdom" that "brexit has divided the nation")? She is evidently not recommending throwing battery acid at anyone, nor justifying anyone who would... and anyone who did that claiming she had would rightly be prosecuted and hopefully imprisoned. Her point, for comic effect, was that brexit had actually united the nation by putting forwards characters it was so easy to hate that one could imagine wanting to do this. It was a distasteful joke, but most comedy is to some extent or other, distasteful. (even the "what's brown and sticky" kind beloved by 8yr old DS). The structure of her contribution was very clever, and she knew it was distasteful, by her planned "sorry!" right at the end.
It is totally different from a politician or anyone else inciting violence by saying they would take up a rifle to deliver brexit, or whatever. She was not inciting anyone to throw anything at anyone.
The rest of the first 10 mins of the show which has escaped censure included a conflation of women and the mentally ill "as if there were a difference", insulted the entirity of the house of commons generally, and several politicians including Jeremy corbyn personally, was rude about the Welsh and called the audience a bigoted bunch of racists (or similar). Against that background, the free speech of Jo B wasn't out of place or inappropriate. IMO.