He was just a very opinionated person when it came to certain things and Tidus happened upon a subject he happened to be a bit passionate about. It was Tidus' good luck.

"I'm not really trying to argue with you exactly." Senku responded with a bit of a blink.

He turned his attention at another pod to carefully remove it from the tree as he reset his thoughts.

"Nevermind." He added, just to let Tidus know he was in fact, dropping the topic and wasn't going to continue. He wasn't trying to upset his friend after all.