He's grown up. It's for your own good, Hank.... Or something like that.

"I could probably pick it up on my own with the knowledge I have, but I figured that learning from someone who knows how to already would be more productive," he'll just shrug. Looking down at his outfit and back, "I would rather not get my jacket dirty." Not that he really cared that much.

If there was a chance to stay clean and look sharp even after cooking, why not take it? If nothing else, Connor may not know much about fashion, but he'd rather look his best than to unnecessarily get himself dirty.