Hazrat Hakeemul Ummat Mawlana Ashraf Ali Thanawi ra said:

One of the reasons of being upset in Hajj journey is that one considers himself to be of higher status (i.e. takabbur). In journey when something occurs that they consider below their eminence (e.g. traffic jam, delay in food, etc.) they get upset and start grumbling.

If everyone effaced himself, forgoing his ego, desires and status, and considers himself to be a khadim (one who provides service to others) none of these will happen.

Waaz: Hajj al mabroor,Khutbat e Hakeemul Ummat ra, volume 17 Sunnat e Ibraheem, page 263-4