system
Given the following post, respond as if you're commenting on Reddit:
human
[Predator] Is there anything a Predator wouldn't consider hunting?

Title edit: Or might consider hunting but decide against it.

Anything a Yautja would think is too powerful to hunt?
gpt
There's an entire hierarchy of game available to each yautja. For instance humans and other intelligent aliens are considered restricted game to unproven hunters. Predators are also required to match the capabilities of their quarry in the hunt. So while a Kodiak grizzly may be a lesser quality hunt than a human any predator fighting it must do so hand to hand since bears don't use tools. Similarly predators used to hunt humans without plasma casters until humanity developed more modern firearms in the mid 1800s. 

So with these rules in mind most predators stick to challenging but fairly reasonable game with only higher ranked predators taking on more epic challenges. Ahab for instance went after an engineer after spending centuries tracking one down. But their are certain legendary hunts that are allowed but so dangerous they're rarely undertaken unless absolutely necessary by their honor code. Hunting a queen xenomorph has only been successfully done by a single lone predator using wristblades and a spear. Any other queen hunt is usually undertaken by a group so a lone predator may reconsider the loss of honor for fleeing the hunt an acceptable alternative. There's also the abomination hunts which are exceedingly rare but considered mandatory for any hunter that is aware of a predaliens existence to stop everything it's doing and utilize every tool they have to kill it. Ignoring the hunt or fleeing from it is a death sentence for predators. Then there's bad bloods who are predators that have broken sacred laws or become so dishonorable they are marked for death. Many younger predators will flee from a bad blood hunt rather than risk the challenge of fighting one of their own which in turn will see them labelled a bad blood for refusing to honor their duties. 

So there's a handful of named hunts that are considered extremely risky but available to many hunters that may refuse often at their own peril. The vast majority of hunter however choose hunts that are within their skill range and purposefully handicap themselves to make the fights more challenging. A hunter rarely will ignore a hunt when given an opportunity and is more likely to be denied the hunt by it's superiors rather than risk the shame of turning down a challenge.