Yogi: In our daily life, we should not have liking and disliking because they are defilements.
Sayadaw: It depends on your understanding – when wisdom is present, the mind does not like or dislike. If there is delusion, liking and disliking arise. You cannot stop defilements from happening.
Should or should not, does not refer to stopping defilements. You cannot say liking and disliking shouldn’t arise; should or not means not to follow or resist the defilement.
When defilement comes, we should not allow it to continue. How not to allow defilements from continuing?
We should have awareness and wisdom, and try to meditate; then, the mind cannot intentionally think about (and grow) the defilement.