How should I keep the spare inner tubes? These spares are stored in the pannier in our garage whose temperature is often cool.

Kap

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SoCal for now.

Cool is fine.

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I suffer from the same sensitivity that you do. A few nuggets of wisdom were shared with me and I'm "trying" to incorporate them into my life. First, remember that nobody can hurt your feelings unless you let them. You can always reject what is being forced on you emotionally.
Second, nothing changes unless you change it. If you don't want the behavior to be repeated then you need to take action. Otherwise the kid has learned that his behavior is the way to get things done, because everyone lets him get away with it.
In the meantime I sympathize because I've been there.
-beerman

yeah, cool is far better hot. If it gets super hot in there, I would store them inside. Super hot is a Phoenix garage with a black roof and no circulation.