I am pretty much colour blind and have friends from all continents and most denominations. From this I know that people who have grown up in different cultural contexts have altogether different sensitivities.
This you must take into account when engaging with people from different cultures. For instance, you have to know the dos and don'ts if you socialise with African American Baptists, Ashkenazim, Irish Catholics or Thai Buddhists.
I also think it applies to all forms of communication, including visual.