It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "When any of you eats or drinks, let him eat and drink with his right hand, for indeed Satan eats and drinks with his left hand."
Hadith Referenceسنن دارمي / من كتاب الاطعمة / 2069
In this hadith, eating with the left hand has been described as a characteristic of Shaytan; therefore, one should avoid it. Following in the footsteps of Shaytan is to cast oneself into destruction.
Those people who, sitting at tables and in imitation of others, eat with the left hand and consider this to be sophistication, they too are merely imitators of Shaytan.