and should start to beat his fellow slaves and should eat and drink with the confirmed drunkards [literally, the (ones) getting drunk],

Certainly the time was past for getting drunk, either on literal wine, or in a spiritual way with the religious drunkards.​—Isa. 29:9; 1 Pet. 4:3.

They would start to ‘beat their fellow slaves’ in a verbal way, opposing them and their work of proclaiming the good news of the Kingdom.

This ‘beating their fellow slaves’ in a verbal way would be because they wanted to dominate or exercise power over others. They desired a high position so that they would be looked up to.