I have no horse in social Darwinism, but I have no horse in the safe-space trend either, and all that it entails. The real problems here are:

1. I want to use the X-card because it’s there so I will use any excuse (like your character calling mine a “reeeetard”).

2. I don’t like where this is going because my space monkey must be awseome, and also ostriches, there must be ostriches. Which means to me “I don’t want to engage with the other players”.

3. I feel entitled to call everything off at the slightest sign of discomfort, which means to me “I don’t want to engage with the fiction”.

If you don’t want to engage with the others, or the fiction, there’s an even more powerful X-card: don’t play.