People whose porn use is out of control, however one may label their condition, most certainly do experience withdrawal, and trivializing that withdrawal as being "a bit grumpy at most" is both unhelpful and wildly inaccurate.

Withdrawal for problematic porn users includes insomnia and other sleep disruption, mania, despair, extreme irritability, intense craving, hyper- and hypo-arousal, and distracting ideation, just for starters. None of these are surprising, as they reflect the abrupt removal of a reward stimulus on which the user has become reliant. Indeed, it is common for those experiencing these symptoms to develop or fall back upon co-addictions, such as drug or alcohol abuse, or other reward-seeking behaviors such as gambling.

It is for these (and many other reasons) that treating out of control porn or internet use (or gambling, e.g.) as a version of an obsessive-compulsive condition vastly over-simplifies the issue.

Addiction is a disease which manifests in a variety of disordered behaviors. To suggest that a behavior is not symptomatic of addiction merely because it involves an intense physical and psychological dependence on the stimulation prompted by sexual imagery, suggests a fundamental misunderstanding of the mechanisms of addiction.