What even is this relationship he's gotten himself involved in... if it wasn't so dumb, Tidus might take the time to question it. As it is, he's just going to think about how dumb this is, before the next dumb worry comes up-

"Hey hey hey." Hey. Slow down, Della. "I already need to watch out for that with him! He made me drop my food back on Terra. And then I had to trick him to stick around and eat with me!"

Is this really the time to share every dumb interaction the two have had. Sure, why not.