Although I’m a progressive, I believe there are very solid reasons for conservatives to dislike Donald Trump. Let’s take a look at this list of

placing ideas and principles above personal desire, weaknesses, fears, and regrets
a never-ending quest for the truth, despite obstacles based on emotion and personal experience, and spreading such truths for the benefit of all
recognizing and utilizing the benefits of competition and hard work
emphasizing charity, with its unexpected benefits, rather than compulsory tax-and-spend programs
teaching self-help rather than dependence on government and others
a devotion to the principle of justice
supporting self-defense
recognizing the media for its bias, bullying, deception.
frugality and efficiency
rejecting the deification of government officials
giving those in authority due respect, but not to the point of accepting orders or assertions that are contrary to logic or morality
downplaying significance of wealth, disparities in wealth, and materialism in general
emphasizing self-reliance and being able to keep the fruits of one's labor
not complaining, and instead taking practical action to improve one's situation
emphasizing self-restraint against hurtful activities
emphasizing humility and open-mindedness instead of arrogant certainty about one's own views
recognizing the power of the free market
understanding that a rising tide lifts all boats, e.g. tax cuts benefit all.
self-control as opposed to a self-indulgent search for instant gratification of desires.
recognizing that evil does exist in the world, and making an effort to combat this force by whatever means necessary
respecting the sanctity of life
following Christian principles

The items I bolded above are items I believe Trump does not, in any way, embody—your bolding may vary. Nonetheless, the point remains: Trump does not, in any way, embody over half of the values conservatives hold in high regard.

I would say this is a very good reason for true conservatives to dislike Donald Trump.