Sealioning

This is a common, subtle harassment which consists of pursuing people with persistent requests for evidence or repeated questions, while feigning ignorance, sincerity, and politeness. It may take the form bad-faith invitations to engage in debate, often trying to incite in order to play victim. It may take the form of "incessant, bad-faith invitations to engage in debate."

The troll feigns ignorance and politeness, so that if the target is provoked into making an angry response, the troll can then act as the aggrieved party.