I think content that could realistically pass the threshold to see people disciplined from work, or kicked out of a political party

No. Sorry. Pure cop out. All you have done is passed the responsibility elsewhere. I shall rephrase the question. What lyrics should cross the line to get you disciplined at work, kicked out of a political party or censured at a music venue? There are the obvious ones that have been mentioned. There are lyrics that are offensive to many other people. Should they all be banned or censored? And, yet again, who decides?