Any truth to the rumor...
That Young never got another spaceflight because he was critical of the mistakes that led to the Challenger accident in 1986? Please note I know he was one of the older astronauts, but he was more than qualified and his last flight on STS-9 was just 3 years earlier.
The two Morton-Thiokol engineers who whistle-blew on the bad solid rocket booster problems weren't paraded as heroes, either.