rsync over ssh triggers a "Cannot execute command-line and remote command" error

Question

I want to copy files using rsync over ssh, but a "Cannot execute command-line and remote command." is raised, meanwhile it works fine with scp.

Command : rsync -ravh folder XXX:folder

My ssh config is configured as follows :

Host XXX
  Hostname YY
  User user
  RequestTTY yes
  RemoteCommand bash --init-file ~/.bashrc

I noticed that by removing the RemoteCommand option, rsync does the job.

How could I manage to make rsync work while using my current ssh host config ?

Thanks in advance.