Fucking Nodders!

Ok, so I’d like peoples view on the following scenario…

You’re riding along and sense a fellow rider on your wheel. They move out to overtake you however they not travelling fast enough to make it quick and decisive. You slow down once they're alongside as they start pulling in across you. Once in front they slow forcing you to reduce the pace you were at before they overtook. You are then forced to either stay at that pace or re-overtake...

Should you get annoyed or should you just get on with it?

just overtake slow and force them to overtake
repeat until you reach your destination