Some people do not want Christianity to have anything supernatural in it, especially when it comes to things they have not experienced.
They may reject speaking in tongues, working of miracles, divine healing, word of knowledge, word of wisdom, discerning of spirits, casting out demons, curing mental illness, receiving messages from God in dreams, experiencing a wide spread revival, receiving impossible answers to prayer, leading an unsaved person to the new birth, etc.
They reduce Christianity to a creed, a set of beliefs they agree with, and think that is enough.
Because certain charlatans have faked or improperly engaged in spiritual practices mentioned in the Bible, these doubting Thomases reject the practices altogether.
They become very hostile toward anyone suggesting that there could be valid and biblically proper ways to engage in these practices. If they have not done it, then nobody else can either.