With this sort, it's nothing to do with being taken seriously; it's enough that you take them at all, give them and their thoughts the time of day. For them, that's a huge win.
I don't suppose you've had too much experience of this but, no; they're like children or neglected, ignored hounds. They will do and say whatever gets them attention. And it makes no difference whether it's good attention or bad. The attention itself is all that mattress. #DaddyIssues