The Urban Dictionary defines “don’t be that guy” as what you say to someone who is acting stupidly or with
a high degree of lameness or foolishness. When somebody is being dumb or annoying you say to them, “Dude, don’t be that guy.”
“...Anyone (who) is a hearer of the word and not a doer, he is like a man who looks intently at his natural face in a mirror. For he looks at himself and goes away and at once forgets what he was like.” Don’t be that guy!
In this passage, James describes a person behaving stupidly, lamely, and foolishly. They presumably value spiritual truth, taking time to understand what God’s Word says vis-à-vis their own life experiences: their actual behavior,
character, and motivation. But then, having obtained that tremendous insight about themselves, they do nothing about it! They simply walk away from the understanding they gained. They are unwilling to embrace the spiritual insights God brought into focus for them. Consequently, they are unable to incorporate these truths into their life; they experience no growth or transformation; and languish in a cycle of stagnancy. Let’s do everything we...