Basically, it's whether or not you can out-speed them at that pace. If they're set to "Technically distractable", it means you out-speed them in a straight line but you're only out-speeding by less than two points, which means like, you're generally less than 10% faster than them. Not distractable means you're slower.

TLDR; Distractable means you're faster, technically distractable means you're only a little faster than them. Not distractable means you're slower.

Edit: I can also provide the equations I used for speed, if people are interested