Why is Donald Trump criticized by so many people?

Read also:

• After 70 years of the crappiest computers ever made, why does IBM exist?
• Why do I sweat so much at the gym?
• Is it possible for buyers to negotiate after an inspection if the appraisal is lower than expected?
• Have you ever secretly watched someone while they were doing something private?
• Is it wrong of me to feel uncomfortable that my friend thinks my brother is hot?
• Why do I (45, male) feel like I'm crushing on a girl (19, female)?
• Why do people hate Nickelback so much? What makes them different from other popular bands like Linkin Park, Green Day, etc.? Is it just because they're Canadian or what?
• Can the belief of not worshipping Christ held by Jehovah's Witnesses be disproven using scripture alone?
• Do other British people agree that the UK should reconquer Ireland?
• What do bad boys know that nice guys don't?
• Do you ever feel like you are doing good, but would do better if people hadn’t blamed you or even bothered you? I have gotten lonely, but I always am up to something (creating my destiny).
• If there exists a “New York of Australia”, is it Sydney or Melbourne?