I've got two can openers as well (one that opens from the top and the one that opens on the side). I use the side one all the time because my husband hates it and take the top opener. I'm not a fan of the side opener one either, it makes a bigger mess than necessary all the time! Super annoying!
Anyways, I know what you mean though, in hind site, it's not really the can opener but the "in between the lines" meaning it creates. My husband does that as well, and sometimes I try to make it light and funny to get my point across sometimes I will say something like "Yes, because we were not educated or domesticated in simple things like the can opener in the capitol of Idaho! It's kinda like living in jungle with our loin clothes!" Then I'll mimic Tarzan and grunt and say "Me Amber, you Dave!" He usually laughs and realizes how silly it was. But I can't say I haven't had days where I just wasn't in the mood and super grumpy and would say something like "do you really think I'm that stupid?!" and he knows to back off immediately then! LOL! (I really try not to be like that most times though I promise!)