Is there a quick way to delete Foldered bookmarks directly from Safari bookmark bar?
Since it's a folder, hold down the Command and Option keys, then drag the folder off the Bookmarks Bar. You'll get a confirmation dialog saying "Are you sure?" Just click the Delete Folder button in the dialog.

Holding the Command and Control keys keys down gets you a contextual menu that allows you to edit the name of the folder, edit its contents (jumps you to the Bookmarks window to do that), delete it, copy it, and a few other things.