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?

What's to get annoyed about? He slowed to the pace you were travelling at anyway so he hasn't held you up any. If someone is that desperate to get in front of me then I will accept the free tow to work and be happy that I have arrived just that little bit less sweaty, thank you very much.