I didn’t think you personally took that picture, but your attitude of “it’s perfectly legal” is rather off putting. Something being legal doesn’t make it ethical.
Also, taking a pic at Disneyland with strangers in the background is different than taking a pic of a specific stranger for the purpose of humiliating them on the internet. You know this, I know this, most people know this. It cruel and wrong. Not that hard to parse out really.
When capitalist alienation got people thinking performativity is direct action. When it’s really just performative activism.