What kind of comments might be characterized as 'caustic'?

Comments characterized as 'caustic' are typically sharp, biting, or cutting, often infused with sarcasm or criticism. The word itself implies a certain acidity or severity that can hurt or sting, much like a corrosive substance. Therefore, harsh comments fit this definition perfectly, as they can be damaging to someone's feelings or reputation through their severity or bluntness.

In contrast, supportive, friendly, and encouraging comments are all positive in nature, aiming to uplift or assist someone rather than criticize or undermine them. These types of comments foster a sense of goodwill and are fundamentally different from the scathing nature associated with caustic remarks.