Eating and drinking during Friday sermon
Speaking during the Khutbah [sermon] of Jum'ah [Friday] is haraam [impermissible] even if it consist of ordering good, glorifying Allaah, eating, or drinking...
[Hanafi school of thought - شرح فتح القدير ]
Everything which negates remaining quiet is haraam [during the Khutbah of Jum'ah] even if it consist of something which is not al-Saami' such as eating and drinking and moving something because of which sound is produced such as paper or cloth, or opening a door...
[Maaliki school of thought - حاشية العدوي]
The Shaafi and Hanbali schools of thought say that eating or drinking during the Khutbah [sermon] of Jum'ah [Friday] is not haraam but makrooh [disliked]
[See المجموع للنووي]