If you don't know anything at all about Christian ethics or faith-related teachings on marriage - and judging from the Twitterverse and fans of the Huffington Post, they don't - you might find it strange that Mike Pence restrains his behavior in certain ways out of respect for his wife. Now, if you were a serious person, or even just a curious one, you might want to learn more about why he does these things. He's had a pretty darn successful marriage, after all, so the Pences must be doing something right.
But if you're the type of people who dominate these corners of social media, you'll skip all that and just go straight to mockery. Because that's the kind of person you are. How much does Mike Pence respect his wife Karen? A lot. So much, in fact, that he voluntarily avoids certain situations that would almost certainly be innocuous, just to go the extra mile and ensure there is never even the slightest hint of broken trust in the marriage. This is known among Christians as the Billy Graham rule, because it tracks with limits Rev. Graham has long placed on his own behavior.