If two people agree to a debate, but one of them participates in bad faith, and spends the majority of the time talking over the other, sidestepping virtually every point their counterpart makes, blatantly lies, employs personal insults and frequently airs irrelevant grievances, is it still considered a debate?
Sort of. What passes for “debate” often isn’t as controlled as it ought to be and people don’t necessarily know how it should be done - “what do you mean, ‘yeah well, your mother’ isn’t a valid argument?!”.
When it’s clearly bad faith, there’s no way to get any value out of that situation, so I’d be edging slowly towards the door.