I met a ton of guys while I interned at the agency. Other than Bonds, can't really say any of them were dicks. Many were distant or somewhat surly, but no one else was an ass. Used to work at a card store during college and worked a show one day where Mays was signing. Our table happened to be really close to the table where he signed and that dude is a rude mother f*er, worse than Bonds. Just completely uncalled for rudeness.
Bunch of guys were super nice. Tom Gordon being the one that comes to mind, super nice guy. Funny and engaging as hell, he was like an adult child, just a super nice guy.
Met Gerry Cooney while he was training for the Holmes fight, I was about 7 or 8. He was nice enough to sign an autograph for me in the middle of his dinner (I know, stupid, but I was 7) yet I remember thinking he was rude when he left the restaurant and was squirting his water bottle all over the floor.
Dave Winfield was rude to a buddy of mine when he was a kid.
Met a ton of other guys that were pleasant, Piazza, JT Snow was a super nice, good guy, Schilling, Bobby Bo, Mike Fetters. Bud Selig also was, met him at a restaurant during a buddy's bachelor party at spring training. We were wasted, got up 3 separate times to take pictures with us. We weren't thinking and lacked manners to interrupt him but he was very kind.
Brady Anderson was kind of a dick, didn't do anything in particular but you could tell he thought his shit didn't stink.