One word y'all: ignore!
Not trying to be overly critical here, this is a great community as a whole.
Give someone the benefit of the doubt for a post or two and then don't converse with them. The more you quote or argue, the more you give them exactly what they want. You can respectfully disagree but when it gets disrespectful, cut it off. Let it goooo, let it goooooooo ?