"I suppose we should be grateful for the panacea we have," he says, though he's frowning slightly. Obviously he knows, intellectually, that there are people in his own time who have been hurt or shunned for being queer, but Magnus saying teens is making it very easy to picture Gideon or Magnus himself (even though Magnus isn't a teen!), and it's -- genuinely kind of upsetting! He doesn't like it!