Urinating in the kitchen sink is generally considered unhygienic and inappropriate. The kitchen sink is primarily used for food preparation and cleaning, and using it as a substitute for a toilet can introduce bacteria and odors that can contaminate surfaces and utensils.
Additionally, urinating in the kitchen sink can be seen as disrespectful to others who use the kitchen and can create an unpleasant environment. It is important to use designated bathroom facilities for such purposes to maintain cleanliness, hygiene, and consideration for others sharing the space.
If you or someone you know is faced with a situation where the bathroom is unavailable, it is best to find an alternative solution such as using a designated receptacle or finding an appropriate location outside of the kitchen area.