Ironically, unless that 'Dude Looks Like A Lady' thing was more influential than I first anticipated, this was directed at a female classroom assistant, whom (up to now, at least) has shown no signs of being a dude at all. Well, apart from a small grey moustache, but that happens naturally once you've passed the menopause and the testosterone starts to outnumber the oestrogen. Apparently.
Oh, and what is that bloody 'S' thing they keep drawing everywhere? I'm worried there's some weird religious cult amongst the Key Stage 1 children that's spilling upwards.