I find it cute when someone speaking Spanish says “buenas noches” as a farewell. It seems like they’re saying “hello” while waving bye. It’s obvious that they learned Spanish as a second language. But Spanish as a 2nd language is almost universally seen as endearing by Hispanophones, not like some people in the US see people that view English as a 2nd language as insufficient, lesser, or rude.
Edit: Apparently, I am mistaken. Buenas noches can be used as a farewell. Maybe there are differences due to dialect.