Generally, people are unhappy when their leader does not share their values, particularly when they are so opposed to the opposite of those values. Disparaging diversity and denying climate change is not just an “agree to disagree” kind of thing to those who take those issues seriously.
And no, I didn’t do deep into nuts and bolts issues of why tech CEOs might think Trump would be bad for business. But here’s one: the potential inability to hire the very best immigrants. Google and Microsoft have benefited greatly from the leadership of Sundar Pichai and Satya Nadella, foreign-born technologists who are now Americans.