He is one actor I can not stand, especially after meeting/working with him during the filming of "Hardball" in Chicago in the fall of 2000. I was a stand-in for a different actor and was on set for six nights (from 8p-4a, while also working my regular office job from 8a-5p). He had a hard time remembering his lines, was extremely arrogant, and during the last night I was on set, I asked for his autograph on my script call sheet (which I still have) he got all indignant saying, "Professionals don't ask for autographs on set." My response was, "I am an office worker who has no desire to be a professional actor, I was called by the casting company for this. Acting is fun for me, not a career." He still wouldn't sign.
Conversely, I absolutely fell for Diane Lane during the time I was on set. The Production Assistant (PA) knew that I was working my office job during the day and allowed me to find places to sleep when I wasn't needed, as long as I let him know where I was going to be. One night, it was raining and he allowed me to sleep in the makeup area, and lo and behold, Diane Lane comes in for makeup testing. She and I chatted for hours like we were old friends about everything, my life, her life, etc. She was as personable as she was (is) pretty. I was just so awestruck by her that I forgot to ask her for her autograph. (This was three nights before I tried asking Keanu.)