You can have a moral high ground either way. It would be impossible to live in such a way that you are totally free of hypocrisy and anything someone could possibly criticize you for, which is what these people are basically asking in bad faith. They are saying you would have to live an impossible life because they do not want a moral high ground to exist at all. Just because we do not always meet our ideals does not mean we cannot have ideals, or that we cannot note when those ideals have not been met in others. I have not lived a 100% violence free life, but that isn't necessary to call out something like a murder.
You can have a moral high ground either way. It would be impossible to live in such a way that you are totally free of hypocrisy and anything someone could possibly criticize you for, which is what these people are basically asking in bad faith. They are saying you would have to live an impossible life because they do not want a moral high ground to exist at all. Just because we do not always meet our ideals does not mean we cannot have ideals, or that we cannot note when those ideals have not been met in others. I have not lived a 100% violence free life, but that isn't necessary to call out something like a murder.