But we should all be sure that Dutch's training made so he could take the abuse that he was handed down.
The point is that in the movie Dutch was picked as a target was because he was a good specimen. The Pred took his mask off to face him in an even fight. As even as it was going to get.
And such an even fight that was. An old woman could hurt a young man with her bare hands more than Dutch hurt the Predator. Dutch's punch wasn't even like a scratch, but more like a very light tap on the Predator's face.
Dutch's smarts is why the Predator thought him a worthy adversary, and why he won.
Honestly, this argument boils down to people favoring big men, to such an extent that no feat is unrealistic for them. A guy like James Franco defeating a Predator, even if it's strictly through traps and weapons, will be deemed unrealistic, only because he's not a hoss, even though that's exactly how Dutch won.
After all, only big men are allowed unrealistic feats of strenght (sarcasm). Not smaller men, and especially not women.