I think we're getting too theoretical here and breaking from reality in a bad way here.
Two people. One an Fe dom and the other who cares. The Fe dom actually dislikes the other. But, when the other passes the Fe dom in a hallway and tries to strike up conversation with the Fe dom, the Fe dom not just politely complies but acts nice and fond of the person. The Fe dom acted this way because they value social harmony more than their own personal feelings, so wanted to keep the peace. How is the explicit expression of an opposite opinion of yours not a false expression? Remember: You are NOT saying "Well, I'd really rather keep the peace with you; can we?", you are espousing all kinds of opinions that run opposite of how you feel internally.
A la: If you tell a woman she is beautiful, but you do not actually think so... this is not being fake?