Is this Shirk/Kufr?

Assalamu Alaikum! My mother was one time advising me not to spend to much time in the bathroom and was mocking me that I spend hours just rubbing my feet during wudhu.and she also said that dont close the tap again and again during wudhu and I laughed loudly at this. Would this be regarded as Kufr ? Or mocking wudhu or islam ?