a realistic
A realist has strong opinions about the real world. They don’t let anyone tell them what to believe. They stick to what they know.
My mom is a realist. She didn’t believe the fake news about the president. She just wanted to eat pizza.
My friend is a realist. He didn’t believe the teacher was lying about the homework. He just did it anyway.
My brother is a realist. He didn’t believe the hype about the new video game. It was just a fancy toy.