Hello there c:
“white” and “black” magic often have racist connotations behind them. Implying black is bad and white is the better half. Equally, with light or dark magic.
Tw: Abuse.
As for anti-curse or anti-hex, it sorta is founded by the fact that it can be victim shaming if one wanted to cast either on their abuser, if you were wronged, you shouldn’t bite back sort of mentality. Personally, I DON’T curse, but I have had people curse for me. It’s just a personal preference.
These are very rough and short explanations but they are the gist of why I don’t like people who believe these things to follow me.