He smiles at you, jokes and nods.
But something tells me that behind the mask of goodwill there is hostility.
It is difficult to recognize a secret hater, but it is possible. Little things that no one pays attention to will give him away.

And if you find at least three of the five signs, be on the lookout.
The first sign is a glassy look. When a person is listening to you, their eyes will briefly freeze, as if they are looking right through you. This is a sign that they have mentally distanced themselves from the conversation.
The second marker is unnatural pauses before answering. He pretends to think about what you said, but in reality he is holding back irritation.
The third sign is backhanded compliments. Phrases like “You look so… unusual today” or “It’s brave of you to do that” sound like praise, but have a hidden subtext.
The fourth sign is a sudden change of topic when trying to get deeper into the conversation. For example, you are talking about a problem, and he switches to a joke or gossip.
The fifth and main sign is "accidental" touches to your things. He can move your glass, straighten the documents on the table or shake invisible dust off your shoulder.
It is a subconscious desire to violate your personal space in order to assert dominance.
How to respond? Don't confront. Start recording these moments. If the pattern repeats, keep communication to a minimum.
Secret haters rarely go on the offensive, but their energy slowly poisons your confidence.
Remember: you don't have to please everyone. Your time is worth spending on those who truly appreciate you.