It is narrated from Sayyiduna Abdullah (may Allah be pleased with him) that he said: "Four things are part of coarseness: wiping your face while in prayer, praying without a sutrah (screen), urinating standing, and hearing the mu'adhdhin and not saying the like of what he says."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9470