The literary device of irony.
Irony is the expression of one's meaning by using language that normally signifies the opposite, typically for humorous or emphatic effect. This idea of expressing the opposite of what is actually being said/wrote is present on the title: in this case, by the use of the word "Kind".
The effect it has on the reader's interpretation is then to read the poem in a way that recognizes the irony on it.
