GreasyBruce is right in basically everything he is saying.
I don't think many people really "care" about things like the bindi, though. People of color have bigger problems than to worry about stupid white girls wearing a bindi for fun.
Is it cultural appropriation when someone dresses up in a plaid shirt, with a big belt, a cowboy hat, and a rabbit tail tied on their jeans speaking in a exaggerated southern accent yelling "yeeee haaww" or nah?
There are no "double standards". It's not a two-way street. Read up about colonialism and whiteness and how the world we live in today has been shaped by it. White people do not experience racism and there is no appropriation of white culture (European, American, etc) in the same way that there is appropriation of other cultures, because white people literally murdered and enslaved millions of people around the world and FORCED their culture onto those people. Almost anywhere you go, American and European fashion, TV shows, music, etc will be what the upper class in those countries listens to, wears and watches and what they try to emulate. White = Higher status, and that's something that has its roots in colonialism. How can you say someone from India, for example, wanting to dye their hair blonde, change their accent and wear European clothing "appropriation" when India was colonized by the UK and their culture was degraded and British culture upheld as the standard that they should aspire to?
i understand what you are trying to say but it doesn't mean that white people don't have culture and traditions which other cultures can take away from but that is completely dismissed because they are seen as the oppressor which leaves white people trapped in a box because they can't adopt things from different cultures without it being seen as cultural appropriation while the others can get away with it which i think is an unfair double standard.