I'm trying to find a story where a time traveler goes into the future and, attempting to explain himself, people think he is senile or has mental problems.
In the future he's arrived in, people can retire to VR scenarios like being a pirate or living in a harem, but it involves a non-reversible operation on the spinal cord or brain. He's tranquilized and retired out of pity for his mental condition.
This was a short story. I think it was written before 1980 though I probably read it around 2000.