Ds has just turned 4 and started nursery in August. Prior to that he was at home. We had initial settling in problems at the nursery and then everything was fine. However for last 3 weeks, he has been saying he doesn't want to go to nursery because they shout at him a lot. He gets very upset. 
Now although he's not been at nursery before he has always been to groups like Mini Kickers, Little Tiger Cubs, street dance. There has never been an issue with his behaviour before and none of those teachers felt the need to shout at him. The nursery is a tiny private one with 1 teacher for every 4 pupils. I'm struggling with why they would need to shout so much. Am I just out of touch?
Also, when we had his parent's night a few weeks ago they said he rarely writes at nursery and just does scribbles. At home, he can write some short words unaided. It seems to me that he just isn't engaging with the nursery staff at all and despite the ratio of teachers to pupils they're not really spending any time trying to get him to engage. Am I expecting too much? Or are these signs that he's really unhappy and we should think about a new nursery?