For decades the Satanic Bible was the default norm. Even if you didn’t like, it’s like “Leviticus” or the XFL–distasteful, but part of the cultural fabric.
Satanist Swati Runi Goyal’s shirt didn’t really offend an American Airlines crew. Goyal is what they don’t like, and the shirt is just what tipped them off.
Like Satan, our modern American Christmas is a blend of competing religious influences but most prominently a work of of popular and commercial culture.
When they ask “Why Satan?” what they mean is, “If none of my damaging assumptions about Satanism were true, then why are you a Satanist?” Absurd.