I like to treat people as I would wish to be treated Well so do I, but I hardly think not letting people in front of me is mean! Like I said before, I have waited too & why should someone who has been in the store for 2 minutes & JUST joined the queue get to go before me, when I have spent a lot longer in there & probably been in the queue MUCH longer than them.
But it's all part of Aldi and Lidl etiquette to allow someone with only a few items in front of you if you have a trolley. You need to read the rule book if you're going to shop in these shops. SERIOUSLY doubt that Lidl & Aldi have a queueing rule book! Please...Yes, it may be common to allow those with fewer items to go ahead of you, but I doubt there are rules within the shop that state this is a must!
It isn't rude, mean, horrible, selfish etc to hold your own place in the queue & to go through the check out when you get there. I have never felt the need to ask to go before anyone, nor have I expected to be let through before anyone.
I have offered, but for some reason over here (Australia) people look at you like you are very odd if you ask them if they want to go in front of you. Which is rather odd, as they all usually push in & can't queue elsewhere...supermarkets seem different in that respect.
What does annoy me though, are the people who use the self serve checkouts for a trolley full of stuff, which obviously takes time. It also stuffs up all the time as you can't fit it all in the bagging area, so they constantly need the assistant to over ride the system every 5/6 items!