While I understand that this situation is totally messed up, no matter what anyone says to you, it STILL doesn't give you the right to physically assault someone IMHO. Walk away and tell a security guard once you have separated him from your wife and diffused the situation. Fighting for any reason other than for self defense is not manly, its stupid. I wish I would have realized that in my earlier days and saved myself some trouble. Going to jail for laying out someone running their mouth just isnt worth it, trust me. If someone lays hands on someone or is being physically threatening sometimes a fight can't be avoided, but being the person who brings physicality into a disagreement should be avoided at all costs IMO. It may feel good to blow up and hit someone who is not physically threatening anyone, but its just not the right thing to do.