may be more helpful, and directed to us the travellers and/or tourists would be some tips infors about the worst habits we (tourists/trvellers) bring into other countries/continents/cultures and how to avoid it.

Let me start: Please don't dress in shorts on the Streets in Bangkok/Thailand (you hardly will find a single Tahi in shorts, as poor as he may be). A Thai will just judge you (but never say so, still laugh at you) as not-knowing/not-caring.