What exactly is the definition of sarcasm?
As I’ve understood it, verbal irony is when the literal meaning of a sentence differs from the appeared meaning (it is opposite/close to opposite). If the irony is directed at a person in a slightly ”mocking” way, it is called sarcasm (MasterClass).
An example of sarcasm according to Literary Devices is "Zombies only eat brains. You're safe". I do not understand how this is considered sarcasm. The obvious meaning of this example is "you have no brain/you aren't smart" but then how is it sarcastic? It is only a rephrasing of the basic meaning (you have no brain). You could have added "you are safe because you have no brain", and the meaning of the sentence would remain the same, but it is implied already. The literal meaning and the intention are the same/synonymous.
It's like writing "you're not smart" instead of writing "you are stupid". The statements basically mean the same thing, they are only formulated in different ways. I understand that "you are safe" is a more positively charged sentence than "you have no brain", but does that make it sarcasm? They are still considered synonymous, not the opposites of each other?
If sarcastic sentences should be read as the opposite of the actual phrasing, then this example should be interpreted as if the person is not safe, meaning that they have a brain (since that is the opposite of what is written, but it is obviously not what is the intention of the sentence). If it is only the rephrasing that makes it considered sarcasm, then by definition "you are not so smart" should also be considered the sarcastic version of "you are stupid". It feels very strange, because the sarcastic version would be the opposite of what you mean, so in the latter example it would be ”you are smart".
It was not only this sentence I didn’t understand the sarcasm in, all the examples were just smart reformulations of criticism. In what way is this sarcasm?
Link to Literary Device: https://literarydevices.net/sarcasm/