I definitely agree with the older and slower in my case, but not the fatter
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On the Highland Fling last year I was amazed at how many runners said hello when passing, being in the first wave start that meant one hell of a lot of faster younger guys overtook me - the majority said hello or how are you doing. At every aid station I shouted thank you or hello to the marshalls giving out bags or handling the timings, its only polite
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I have to agree though that some runners on that race were bloody downright rude! Two of us plodders were completely barged and elbowed out of the way by a couple of relay runners on the narrow Inversnaid stretch, all they had to do was shout Hi, coming through please? .....If I'm there this year I will push the feckers in the Loch
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I arrived at the Bein Glass aid point to be greeted by a very grumpy marshal - I said Hi there, she glowered at me! There was a general air of the marshalls being very very pissed off at this aid station - I checked in and just got my drop bag and carried on. I later found out on the Fling forum that this was where a number of runners had been extremely abusive to the marshalls - one marshall was refusing to be involved in the event again and the Bein glas farm / campsite people were also hacked off with the behaviour of crews and runners.
Like Noanie (I think?) said - if someone offends a marshall to that extent, ie is verbally or physically abusive, you have to take their number down and ban them from the next race, its the only way really.