Why do so many Hollywood celebrities dislike Donald Trump?

uh because he's a dumbass lmao?

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I admit that you guys should keep the harsh ones down. You guys should make TRUMP better not worser.

Other comments, there's no need to be that harsh. Yes, I know I will get hate for saying this, but perhaps try to be less stinging with your comments.
As for your question, I believe it's because he's incredibly extreme and voices exactly what he believes in. Which, depending on who you are, can be good or bad. Many people loathe him because of his views and how he had acted throughout the campaign.
I hope this helps. ^-^
(This is just my opinion on the matter.)