Sarcasm is terrible. Here are four reasons why.
1.) Sarcasm is not clever. Anyone can come up with a sarcastic response, at any time. The formula is so lazy and non-creative, most people master it before their teenage years. This is a reason why sarcasm is popular: you can deploy it instantly and brainlessly. Sarcasm is always at your disposal. But this cheapens its value to the point of worthlessness.
2.) Sarcasm ends conversations. It oozes haughty disdain, which is grueling to engage with. This is another reason why sarcasm is enticing: it is an instant power transfer, wherein the person being sarcastic is able to signal their superiority over their interlocutor through exaggerated insincerity. But an imbalanced power dynamic is not conducive to conversation; it shuts conversation down, leaving only silence.
4.) Here's my biggest issue with sarcasm: I can't think of a single situation where it's the best way to communicate something. There's always a funnier comment, a smarter comment, a kinder comment -- but there's also always a more insincere comment, a more hurtful comment, a comment that will end the conversation more effectively. This is a death knell for sarcasm. So when you feel tempted to make a sarcastic comment, challenge yourself to think of something better to say. It will dramatically improve the quality of your conversations.