It does nothing with "hostile". For China, yes, but for most other countries tariff is simply ($USA-import - $USA-export)/$USA-import. That simply, numbers are check for many many countries. I'm sure, USA imports a lot of tea from Sri Lanka and some fruits and wood/furniture.

(Freshly made Sri Lankian tea is the best, IMHO! I mean, proper tea, not all these grasses, berries and synthetic aromas which are named "tea" in modern western world).