Reggie Jackson, who had a reputation for being one of the biggest A-holes in professional sports, always took time to sign autographs at Yankee Stadium. He even signed an autograph for me after he had to scold me: "Can you get that thing out of my face?" when I was waving a book at him in a mass of fans next to the dugout. LMAO.
I always found that players were more likely to sign autographs BEFORE a game. The crowds were smaller, they'd usually arrive early for batting and fielding practice, and it just seemed much more like "their time" when it came to this sort of thing.
There are unwritten rules for autographs apparently.
A friend of mine’s son (Jason Tyner) played for the Twins Mets and Devil Rays. His dad was telling me he would sign whatever they received at the clubhouse but kept anything he received in the mail and gave away to local kids. I was astonished. Jason is a nice kid but that is a crappy thing to do. Some 10 year old kid may not know the rules and some other kid gets his baseball card.
But some players are happy to accommodate the fans.
Nolan never got too big for his britches and that (along with his peerless achievements) separates him from the chaff.