Is there any way to mute the reflection in the cup? It makes it feel unreal.
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Select the object.
Go to the Object Properties, then Visibility > Ray Visibility.
Now your object will not appear in any reflections. (In the example below, the sphere on the left has Glossy turned on and the one on the right has Glossy turned off.
I highly recommend against doing this, however, as reflections are key to achieving realism. If you're not happy with the reflections on the cup, try rearranging your scene or changing the camera angle.