Hell is eternal because God is infinite?

[RosieLass]

Studying some of the Christian rational for an eternal hell (and yes, I know there are those who don't believe it's eternal, but the people I'm talking to do). I feel that logically, eternal punishment for finite crimes is irrational. But they claim hell is eternal because we are sinning against an infinite being. The explanation they gave was, "when you do something wrong you are not only offending the person you harm but also God (If that doesn't make sense, think of it this way, if you you hurt someones kid are you only responsible to the kid or do the kids parents have some right to be pissed?). If you are also offending God then you are offending an infinite being, so the offense is then infinite." Can anyone explain to me what the hell that actually means (I'm a very concrete thinker so something that abstract goes right over my head), and more importantly, provide some help in forming a rebuttal? I can't even answer on the subject because it sounds batshit crazy to me. I did look for anything on this on here already, but most of what I found winds up degenerating into a discussion of whether hell's eternal to begin with. Thanks in advance for any help.