Reality hits when you see them as a real person with nuanced emotions, deep personal history, and a rich inner world. The reality of a person clashes with the fantasy of them.
What reality are you living in? The one I live in my fantasy of them is this person, but the reality of them is have are shallow, petty, person with the inner complexity of a Disney plot, who thinks nuanced emotion makes you gay and the only personal history they want to know are how many 0s are in your bank account while they tell you their sob story about how daddy didn't love them enough and their life should be 'so much more'.