I don't think agression is about shouting. Andrew is agressive in his attitudes, I find it difficult to explain, but there you are. I do think I'm right. He's shouty and awkward, plus he likes to stir the poo by telling Dave what's been going on. Don't like him.
I agree, I quite liked him at first, but the more at ease he becomes, and the more his shyness evaporates, the nastier his body language and manner becomes. For example the vicious way he was throwing the ball over those people visiting the garden that time, and the cocky way he was staring into space when Jedwood was playing.He seems like one of those people who have been bullied and at the first chance of getting some power themselves choose to bully back those down the hierarchy instead of using his experience to empathise with them