The child may not be playing truant. He or she may be off school for some reason - or on holiday. Rather than perpetuate bad feeling, it might be a good idea to have a word with the parents about the rubbish throwing - in an adult manner. If you see the child doing it again, go out and say: "I bet you can't aim it in the dustbin and "score a goal!" If you turn a chore into a game, children often respond positively. the racism thing, I don't know about, but for everyone's sakes, it'd be preferable to try and get on.