Actually Arcsound is 100% spot on.
A misdemeanor conviction is an incredibly low threshold and it handled often in fast-food style courtrooms.
The basis for repealing someones' 2A rights should be a very high standard for a crime that warrants the punishment. However, a misdemeanor conviction can include threatening language, a minor argument, a minor physical alteration, etc.
As a prosecutor, and someone who's been in legal practice for nearly a decade, I can say that I have personally and anectdotally seen/heard of cases where:
1) Physical/verbal altercation occurs, generally among a couple that has a history of loud abusive arguments or is going through a rough patch. Alcohol is typically involved, so judgment is impaired. It's not typically a person's shining moment nor a reflection of who they are. They could have just learned about adultry or some other serious drama in their relationship and gone off the deep end.
2) Somebody, whether it's one of the couple or a friend/neighbor, calls the cops
3) Many jurisdicitons have a mandatory arrest policy, meaning that if the cops are called, they show up, and someone gets arrested. Usually it's the man, even if it's mutual combatives, because women bruise easier and are more prone to crying and hysterics and the man by default is the aggressor. Another reason is there are often children present and our biast system tends to keep women with kids.
4) Many jurisdicitons also have mandatory prosecution policies, meaning that if there's a Domestic Violence arrest, the prosecutor must prosecute the case. This prevents the DA from dropping it because the 'victim' often begs for the DA to drop it; and to prevent that the DA has to continue on the case.
5) Criminal courts are packed and deals are struck - often the DA will charge some felony (aggravated assault, for instance, if there was any weapon such as a thrown shoe, etc.). Faced with a felony, misdemeanor pleas are common. Or, even if there's no plea, a misdemeanor is trival and easy to prosecute.
Once you are tapped with a misdemeanor conviction for DV (and the SCOTUS recently ruled that ANY Violent misdemeanor eg. a bar fight could result in the loss of 2A), you lose your 2A rights under Lautenberg.
So, in summary, it's a very petty crime, a low conviction threshold and a loss of 2A rights and any job you would hold that requires using/possessing weapons, which are heavily male dominated (police, military, security, etc.).
Completely unconstitutional in procedure and substance and implementation.