Phrase used to politely decline to engage in discussion, with the implication that the original speaker is deliberately trying to upset you and/or posting flamebait.
"So what does everybody think of these illegals coming across the border?"
An overused expression used by 9-year-olds who think that they're funny and random. Similar phrases are "I like cheese", "I like muffins", or "I like cake".
9-year-old: I like pie!!!1111 hahahahalol I'm so clever!!11 :D
Mature person: <.<