It is narrated from Sayyiduna Ibn Mas'ud (may Allah be pleased with him) that he said: "Four things are (signs) of coarseness: to hear the mu'adhdhin say: Allahu Akbar, Allahu Akbar; I bear witness that there is no god but Allah, I bear witness that there is no god but Allah, and not say the like of it; to wipe one's face (with the hand) before completing one's prayer; to urinate standing; and to pray while there is nothing between oneself and the qiblah to screen him (from people passing in front)."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9468