Trip nodded, but still looked uncertain. Being told he wasn't going to be mad made it sound really bad...

"I'm not supposed to play with poor people or people from the boonies, like Kanto, they say they're low class, so..."

In fact, he was so scared that Gold wasn't telling the truth about not getting mad at him, that his nervousness and shyness got the better of him, and he decided to leave the awkward, uncomfortable conversation entirely by turning on his heel to try and run away.