Why is ‘Harem’ in Isekai genre in anime, a problem for people?

I don't think people do dislike harem only in isekai.
Many people dislike harem and many people like harem
 
It's related to what people feel is important. Most of the people around me feel that they can find their soulmates online but if those people are interacting with others int he same way, wouldn't that hurt their pride? So that could be one of the reasons.
 
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