Using the word "retardo" is never acceptable.
It's important to remember that everyone deserves respect and dignity, regardless of their abilities. Instead of using this offensive term, we should strive to use respectful and accurate language when discussing people with disabilities.
If you are looking for a respectful way to refer to someone with an intellectual disability, you can use terms like:
* Person with a disability
* Individual with intellectual disabilities
* Person with developmental disabilities
Remember, language has power, and it's important to use it responsibly.