Some people get very upset when disinterested is used to mean the same thing as uninterested.
- Disinterested: unbiased or objective
- Uninterested: having or showing no interest in someone or something
Disinterested was used to mean uninterested in the 17th century, and modern usage suggests that disinterested is often considered a synonym of uninterested.
However, I would recommend maintaining the distinction in formal writing. This helps to avoid any confusion over your meaning.
I wouldn’t worry too much about the usage in informal writing or in everyday conversation.