I was at a data visualization workshop a few days ago and someone there asked if there are any symbols/colours that might offend people when making charts, the presenter didn't really understand the answer so I helped to explain how in cartography using certain colours to represent certain groups could offend.
For example using yellow to represent East Asian's, Red to represent Native Americans, or Red to represent basically any minority (since red has a connotation of being negative/bad/dangerous)
The only symbols I can think of that have negative connotations are yellow six pointed stars to identify Jewish people, and pink triangles to identify gay people as these were used in Nazi Germany.
I realized I only ever learned this from working with other researchers and was wondering if there is some comprehensive list out there for these types of colours/symbols.