I once took a quiz where you were supposed to guess if a quote came from Angel or Edward Cullen. One quote was from soulless Angel in Buffy season 2 - I selected "Angel" without look at the other options. Turned out I was supposed to check "Angelus" and, per the quiz creator, I'd gotten the wrong option. I was so irritated I stopped taking the quiz - but that is very telling in how much fandom as so internalized the Angel/Angelus divide that they've forgotten it was a retcon.