This brings up two questions for me...
What connection do modern witches have with the prior generation of those who practiced black magic? We cannot pretend it did not happen in the past, or even say it is not happening now. Do we, as light-and-love witches. disavow our brothers and sisters that practice dark arts? What is a dark art? What is black magic? Some people think that love spells are dark, while others seem to believe that witchcraft was invented so love spells could be done. When does a witch cross the line and become a warlock/sorcerer? Are they no longer witches?
2nd question. Should Derek be condemned for using the word "witch" in the way he does? He is a spirit medium and not a witch. It is not in his experience or jargon to be politically correct about the word. When he says "witch", he seems to be saying "practitioner of the black magic". Should he change for us?
If Derek should change, should those who use the word "liberal" as a moniker be condemned? How about those (and I include myself in this category) who use the word "republican" with a certain hint of disdain?
Words word words... can't live with them, can't live without them.