Tito Ortiz was a victim of karma

Guy Mezner beat him ok, then he beats Guy Mezner and flicks him off after beating him, and then Ken Shamrock gets very upset and things like that and Ken and him almost come to blows as Tito is trying to explain to Shamrock he was flicking off Mezner and not him and is carried away by McGarthy like a schoolyard fight

So then he fights Ken's brother Frank Shamrock next and loses. Karma

So I guess him beating Ken was something of revenge to him, beating him like that in front of frank.