The stereotype concerning someone with anger issues is that they just have bad impulse control. You joke that they haven’t slept in a week, they start screaming. But it may be that people blow up not because they can’t hold in their feelings, but because of poor social processing that makes them think your sleep comment was actually you telling them they’re completely incompetent.
Source: Gizmodo – People With Anger Disorder May Have More Trouble Processing Social Cues