The Messenger of Allah ﷺ forbade a man to put on his sandals while standing.
حدثنا أزهر بن مروان البصري حدثنا الحارث بن نبهان عن معمر عن عمار بن أبي عمار
نهى رسول الله ﷺ أن ينتعل الرجل وهو قائم
[Its chain of transmission is very daif]Harith bin Nabhan is matruk (see Taqrib). This hadith has daif corroborating narrations in Ibn Majah, no. 3618, 3619, and in Abu Dawud and others, and whoever graded it sahih was not correct.