system
Given the following post, respond as if you're commenting on Reddit:
human
[Interstellar] Why did no one seem to care when Cooper made it back?

Once he gets back to when Murph is an old lady, you'd thing it would be a bigger deal than astronaut had been gone for that long (relatively) and had experienced time dilation, been responsible for sending a message to his daughter, etc. Not even an acknowledgment from Murph's kids or grandchildren?
gpt
Unlike Murph, Cooper didn't have fanfare or wide-spread knowledge around his mission.  Murph was in charge during the exodus from Earth, instrumental to the cracking of the gravity equation, and likely had a major part in the post-Earth government. Meanwhile, Cooper was a line in the students' textbooks (if even that) about a last-ditch effort to move the population off the planet.

Cooper also doesn't seem like the kind of person to go seeking out that kind of attention.  We see him relaxing in an out-of-the-way part of the habitat, then sneaking off on his own to go back into the wormhole.

No one remembers Ghandi's father or mother in the wider world.