Peter tells his readers that they were ransomed from the futile ways passed down from their forefathers (1 Peter 1:18). Later in the letter, he says:
With respect to this they are surprised when you do not join them in the same flood of debauchery… 1 Peter 4:4, ESV
The word “surprised” is intriguing because it has literary connections in the letter that are not obvious in English. The word translated “surprised” is based on the xeno root which means stranger or foreigner (as in xenophobia, the fear of strangers or foreigners). The standard Greek lexicon defines it this way.
to cause a strong psychological reaction through introduction of someth. new or strange, astonish, surprise*
This connects with a theme within 1 Peter. Peter addresses his readers as “exiles of the dispersion” (1:1). In 1:17, he tells them “to conduct yourself with fear (or reverence) throughout the time of your exile.” In 2:11, he writes:
Beloved, I urge you as sojourners and exiles to abstain from the passions of the flesh, which wage war against your soul. 1 Peter 2:11 ESV
Since we are redeemed from futile ways, we will be different from the world around us. We will seem like foreigners even in our native land, because we are citizens of heaven. This surprise on the part of others should not catch us off guard. It means we are preparing ourselves for another world.
*A Greek-English Lexicon of the New Testament and Other Early Christian Literature, p.684.