Reply #125: two or more

[Iverson]

You can ask for a clarification.
You can let it drop.
You can respond with sharp criticism that does not reach into personal attack.
You can respond by setting your own good example.

Or you can ensure the loss of any moral high ground to which you might aspire by adopting the same tactics that you condemned in your opponent immediately prior.

I get the feeling that you are arguing from inconceivability, which does not make me confident that you have understood my point.