1) Trump's defeat of Hillary in 2016, pushed BACK other yet to be done LIBERAL AGENDA items Obama didn't bring out, by at least 30 years--if not longer. This hurts LIBERAL PUBLIC each and every day.
2) LIBERAL CORPORATE AMERICA does NOT want THE WALL to come up because IF it does, it will force Mexican immigrants to LEGALLY APPLY FOR AND EARN U.S. CITIZENSHIP---making them ALL be paid U.S. Minimum Wage ( OR MORE ) per hr. work wages; no more paying illegal immigrants $3.75--or way less---per hour.
3) LIBERAL CONGRESS ( Democrat majority ) aren't seeing juicy STOCK-HOLDER PROFIT$ they hoped would flourish because President Trump's American economy repair and restoration programs ARE WORKING....just NOT for the corrupt political body of America. When you, in any way, interfere with a crook's unethical / illegal means of making money, you become their sworn enemy.
So when it comes down to why LIBERALS hate Trump---you now see the multi-faceted reasons why they do.