What does he mean by this?

Yesterday, I was chatting with my guy friend who I really like (and who also likes me 🥺) on Snapchat and he said he'd be gone for a few minutes to take a shower.

The conversation went like this:

Me: "Wow, I'm still mind-blown that you can take a shower for just 10 minutes" (Which was true because I told him about my hair treatments before and how they're supposed to sit on my hair for more than 10 minutes)

Him: "Haha I'll show you how I do it, just kidding lol"

Why would he show me how he takes a shower? Even if he's kidding? I mean, why would he say that, in the first place?
What does he mean by this?
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