Personally, I use the product and its "unironic" fanbase as a cudgel to both mock and laugh at them for in these cases. Because they didn't just make a single accidental piece, like your American History X example, but the entire movie fails their intention so hard that it barely comes through in the manner they want. Barbie is another recent example of that, where barely anyone got a feminist message from it but everyone got a pro-Ken one.

Obviously don't give them money or sincere support because of this, but still worth a laugh at its existence and the complete failure of its intention so hard it ended up empowering the people they were attacking.