Mind Set on the Flesh
In the end times of death and destruction, wars or pandemic, the sinner engages in sinful indulgences whereas the righteous focuses on wisdom and spirituality. Their sin is not to be vigilant and wise. Even if the "normal acts" may not have been sinful in themselves, they are described as worldly & selfish in that not everything is profitable (1Cor 10:23-24). The passage shows the worldly mindset of the flesh.
The context of Matthew 24 is the same as Luke 21. The indulgence of the slumbering believer isn't normal but debauchery, he is not doing the work of God. (ESV) Matthew 24:45-51:
““Who then is the faithful and wise servant, whom his master has set over his household, to give them their food at the proper time? Blessed is that servant whom his master will find so doing when he comes. Truly, I say to you, he will set him over all his possessions. But if that wicked servant says to himself, ‘My master is delayed,’ and begins to beat his fellow servants and eats and drinks with drunkards, the master of that servant will come on a day when he does not expect him and at an hour he does not know and will cut him in pieces and put him with the hypocrites. In that place there will be weeping and gnashing of teeth.”
The preoccupation & boasting in the world is the trait of an unbeliever who fails to do the right thing, James 4:13-17. Only the ungodly are said to be preoccupied with eating and drinking, because that is what their heart is upon. That's what life is to them, the lust of their flesh.
(ESV) 1 Corinthians 15:32-33:
“What do I gain if, humanly speaking, I fought with beasts at Ephesus? If the dead are not raised, “Let us eat and drink, for tomorrow we die.” Do not be deceived: “Bad company ruins good morals.””
The Righteous Hates the World
(ESV) 1 John 2:15-17:
“Do not love the world or the things in the world. If anyone loves the world, the love of the Father is not in him. For all that is in the world— the desires of the flesh and the desires of the eyes and pride of life —is not from the Father but is from the world. And the world is passing away along with its desires, but whoever does the will of God abides forever.”
Dissipation means debauched living.
(ESV) Luke 21:34:
““But watch yourselves lest your hearts be weighed down with dissipation and drunkenness and cares of this life, and that day come upon you suddenly like a trap.”
ϰραιπάλη, ης, ἡ [loanword in Lat. crapula ‘drunken revel’] ‘engagement in drunken reveling’, dissipation, binging Lk 21:34.
κραιπάλη, ης, ἡ (also κρεπάλη, q.v.; both ‘carousing, intoxication’ and its result ‘drunken headache, hangover’ are associated in the use of the term, since it means ‘dizziness, staggering’ when the head refuses to function [Aristoph.; Plut., Mor. 127f; Lucian, Bis Accus. 16; Soranus p. 16, 26; Aretaeus p. 110, 2]) unbridled indulgence in a drinking party, drinking bout (Aristoph., Ach. 277; Vesp. 1255)
They were hungover with partying and merrymaking. Their life was all about worldly activities, lacking spiritual things. Compare Luke 10:41, Martha was busy in her worries and troubled with her normal engagements.
The worldly were revelling in their worldly activities.
To revel means to take great pleasure or delight in something. It can also mean to indulge in boisterous festivities or celebrate. When someone revels in something, they are not just pleased or excited, but they are overwhelmed by joy.
When the times of tribulation come, panic overwhelms them, they would try their best to save themselves, even to the point of harming others. Whereas the righteous will sit peacefully and without worries about life.