They think it is strange that you don't run with them into the same excess of riot, blaspheming:
The Greek word for "riot" (asotia) means "incorrigibleness, an abandoned, dissolute, life; profligacy, prodigality" (Thayer 82-2-810). Peter here draws a graphic picture of the overflowing of wickedness and of the ungodly tides that rush to fill all the hollows of evil. Such wickedness is a waste--an overflowing of waste, such as the prodigal son in Luke 15:13 was involved in. James says to lay aside such activities: "Wherefore lay apart all filthiness and superfluity of naughtiness, and receive with meekness the engrafted word, which is able to save your souls" (James 1:21).