To them, you just might be a specific character in their personal movie.
As far as they are concerned, they are I-am-the-main-character and everyone else is just supporting cast. Or you’re an NPC whose job is to give them something specific and they’ll get angry if you don’t. (Patricia Evans uses the analogy of a child with a teddy bear to describe how controlling people create ‘pretend’ relationships.)
Alternately, you might be more than a side character, you might be the antagonist.
You are the villain. They’ll simultaneously demonize and dehumanize you: you are a monster.
Or you could be both if you are interacting on the internet!
(I always laugh when people have arguments online because of how wildly inaccurate their models of each other are, especially if those models are based on what they see online or in ‘the news’.)