SQL Server is about storing data - the formatting for display should be done in your front-end application (web app or whatever). SQL Server / T-SQL doesn't have any extensive formatting capabilities.
Whilst it is absolutely the case that one should do conversion formatting as late as possible - as close to the "user" as possible - it is also the case that there may well be a good reason to need to do so in a query in this case - therefore the comment as written (i.e. without asking for clarification/justification) is not really a positive contribution and certainly NOT a great comment.