Liberals hate Trump because polls show him winning not only the GOP nomination but also the Presidency.
The Washington Establishment GOP 'leaders' hate him because he is a 'maverick' - not one of them, not controllable, not predictable, and is actually (for now) championing the feelings, anger, and desires of the American people - actually representing them instead of bending them over and giving them 'what they will get' as the GOP leaders have been doing.
Special Interest groups hate him because he isn't taking any of their money (supposedly), so he doesn't owe anyone favors and is not able to be bought yet.
Illegals don't like him because he scares the hell out of them - a President who vows to not only secure the border, one who vows to enforce EVERY immigration law on the books, but one who has declared he will send all the exist9ng illegals in this country packing back to Mexico.
The Islamic Extremists and 'refugees' hate him because he has vowed to protect Christianity, immediately stop the un-vetted flow of terro, er, 'refugees' into this country...
Big businesses, like the ones reportedly closing down factories and sending them to Mexico the last 2 weeks and others who have betrayed the American people by taking their factories overseas to take advantage of import-free products made by slave-labor, hate him because he believes in American-1st economic trade where we are treated equally / fairly instead of remain the world's doormat.
ALL THE RIGHT people hate him for ALL THE RIGHT REASONS! Part of the reason I am so drawn to him is not him personally but because of those who are fearful of and hate him!