Downers can be good if we’re so ‘up’ that it helps us feel more sane. Downers are good if its a hill or a mountain and we’re on the route back down. Downers are a drag and do not feel like anything good when it means that instead of being happy or in a good mood we feel sad, disappointed, hurt, let down, rejected, dejected, etc..
Sometimes, whether or not an event is a downer depends upon our own attitudes. Sometimes it doesn’t. Sometimes, it does but it doesn’t seem like it.