hurler on the ditch

A person who offers unsolicited criticism or advice about something in which they are not an active participant. Taken from the sport of hurling, a player of which is a hurler. Primarily heard in Ireland. All these people condemning the political process from social media, many of whom I'm sure don't vote, are just hurlers on the ditch in my opinion. Can you stop with the commentary? You weren't actually there, so you're just a hurler on the ditch at this point. Geez, I didn't ask for your advice about my love life, so can you stop being a hurler on the ditch? Thanks so much.