 One argument from exclusion, with a more ad hominem twist, claims that the dialetheist has trouble with expressing disagreement with rival positions in debates (see Parsons 1990, Shapiro 2004, Littman and Simmons 2004). For when the dialetheist utters ‘\(\neg A\)’, this is in itself insufficient to rule out that \(A\) is the case, given that, in a dialetheic world, it may well be that both \(A\) and \(\neg A\). Similarly, ‘\(A\) is false’ and even ‘\(A\) is not true’ might not do the trick, since for the dialetheist some \(A\)’s being false, or untrue, does not rule out its being true. As Parsons puts it,