To be clear, I think it was over his Michael Jackson and Maria Renard shipping. Put together what people know about that particular seedy underbelly and the age of young Maria Renard, well....! TBF, HOWEVER, I don't think he even is aware of the implications. IIRC he's talked about both before.
I find myself wondering if he was shipping young maria or symphony of the night maria who was older, that being said, shipping dead people with fictional characters is just.....weird.