I DID enjoy travelling through about 40 countries, I DID major in anthropology as part of a degree in HUMANITIES and I DO love the world being multicultural

Who wouldn't enjoy travelling through 40 countries, even on your proverbial shoestring? And haven't some of the most extreme racist thinkers in history used anthropology to justify their odious claims? And is not one of the classic racist arguments that whilst they love a multi-cultural world, they wouldn't like the buggers living next door? None of this proves anything, WAV - it's just hot-air and specious rhetoric; nor does it in anyway challenge any of the claims that have been against you, which you seem to quite purposefully avoiding.

Gardening is an indulgence, not a necessity; however, a broader consideration of natural / native ecology can in no way be used as a metaphor for human culture unless you're suggesting that different ethnicities would somehow run rampant, much as certain non-native plant species have done, Rhododendrons and Himalayan Balsam to name but two.

People aren't plants and different ethnicities are not different species. If anything, I'd say this argument only serves to double-dig your racist trench even deeper.