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You think it's hard for you? I prefer playing with the music turned off, so I can never tell whether he's seen me or not because I never hear his theme music playing, only the footsteps. I have to check around to see if he's noticed me yet.
Also, just use the videos that show you how to juke Mr. X. If you aim at him, and then run away, he's programmed to take a punch at the place where you were standing when you aimed at him. So, if you aim at his head for a few seconds, then back track away, he'll stupidly punch at the empty air where you were standing, and you can run past him every time.
Also, his move where he grabs you and throws you backwards doesn't actually do any damage. Sometimes I'll try to run past him on purpose, knowing full well I'll get thrown backwards, and when he resets to do his stretching animation, truck past him anyway. He's not so much a threat once you learn his patterns. He's actually quite predictable.