Should we use spring singletons for DAOs

In our web application, we are using Spring as dependency injection mechanism. We have multiple DAOs and Manager spring beans which has a default scope of singleton.We have made sure that all of these beans are stateless. I have read at multiple places why singleton pattern is bad : What is so bad about singletons? .Forgive me if this is asked already but please answer if the above mentioned design comes under bad coding practice and also how improvements can be made to same.