Don't make second dates, then cancel them. Don't say, fake-regretfully, that you're busy every time he calls. Don't simply fail to call him back and hope he'll go away. That's how I feel. Then get off the phone.
Men are really very hardy creatures.
They will survive. Doors, Holding of Whoever's closest to the door holds it. But if an old guy turns somersaults trying to reach the door before you, or moves exaggeratedly to the side on a crowded Otis to let you out, just let him be chivalrous. On a related note, getting huffy if a man doesn't open doors for you is also silly. If there's a double set of doors and a guy opens the first set and lets you precede him, you should simply open the second set and hold it for him.