I think Gonzalo was embarrassed by his Tio Juan because he tasted the dirt and he made Gonzalo go through a junkyard. If anyone saw him there in the junkyard, that would be really bad for him! People could make fun of him, ‘Gonzalo, the junkyard boy!’ and, of course, no one likes that! Also, Tio Juan, tasted the dirt. This probably seems disgusting to others who see Gonzalo next to the man tasting the dirt. And since, Cleveland is city, there are no farms there so people are probably not familiar to tasting dirt. They probably think that Gonzalo tastes dirt too! That could be bad to Gonzalo’s reputation, and people could make even more fun of Gonzalo, he doesn’t even speak English well.