Sealioning
About
Sea-lioning is a style of personal interaction in which one person (the "sea-lion") insists on engaging one or more other people on a subject they wish to abandon, and/or requiring explanations or defenses of their position on that subject. It is most notably characterized by an unfailing adherence to the appearance of civility while in fact being highly disruptive and obnoxious, and seizing upon any lapses in civility that others may make as evidence that they are in the wrong.
It is related to the just asking questions debate methodology, and is arguably a form of rhetorical deception in that it exerts influence without justification by shifting the window of discussion (see interpretive framing).
Origins
The term "sealioning" appears to have originated with Wondermark comic #1062: The Terrible Sea Lion (2014-09-19).