Homie I have to break it to you but (as someone who hyperfixated on Joker for a year) there's been plenty of Batjokes queer coding. Joker is often considered a very queer coded character (hell one person EVEN MADE a essay about the coding of Batman AND Joker AND it is a published book you can ACTUALLY BUY which I did get teehee). Alongside this, Joker has a obsession with Batman (often in the context of Batman having "made him" via the vat of chemical back story) and has called him many MANY pet names AND terms of endearment. This is especially obvious in The Dark Knight Returns Part 1 and Part 2 comic story line AND New 52 Batman with the Death Of The Family arc.