What are antonyms of "tolerant" or synonyms of "cautious"?
Solution 1:
The literal antonym of tolerant is intolerant. It seems like that would be a good fit for your post from the snippet that you've provided.
Other options would be unforgiving and aggressive.
Since this is for meta, don't forget to include a hand drawn picture of a circle around a unicorn that's in the midst of making a jquery joke.
Solution 2:
One more possibility would be "strict."