Why are all the pop culture, media celebrities/elites always liberal and against Trump?

You mean like Ronald Reagan, Tom Selleck, Gary Sinise, Bruce Willis, Jon Voight, Drew Carey, Stacy Dash, Dwayne “the Rock” Johnson, Robert Downey Jr., Stephen Baldwin, Jon Lovitz, Dennis Miller, Rob Schneider, Melissa Joan Hart, Kelsey Grammer...

The media is run by corporations who dont want open and honest reforms; the celebs and pop culture people are usually Democrats and dont like his ideas; the elites in Washington are corrupt and dont want that to change.

Actually, there are several celebrities who have come out for Trump, but after this last fiasco, It is hard to say how many will stay that way.

These people familiarize themselves with other cultures. That's why conservatism is dying. It's only a step away from middle eastern ideologies.

The more you travel to other countries, the more liberal you become.

Because most of them are mature adults

It depends upon who is for what and who would not be in what they have forwarded.