You're brave going there in half term!
I was in the supermarket a couple of weeks ago and the woman in front had her teenageish child with her who was being so rude to her, in a really rude/disgusted voice child was questioning ALL of mums purchases. 'why have you bought the big ketchup' ' why are you buying butter, we've got butter' in a really 'you're a bleeping idiot' tone and the mum was just saying stuff like 'well done for considering we already have butter sweetie. I'm going to make extra sandwiches for a picnic on Saturday so I need extra butter' ' well done for knowing we don't usually need the big ketchup, I'm buying it this time because it's such a good deal'. Then child basically slung some shopping in a few bags in the trolley without care eg bread in the bag then 6 pints of milk on top then chucked into the trolley on top of the cakes, mum praised child again for helping and great job and stuff. Then as they walked away child said I better get at least a tenner for helping with this tit and stormed off in front. I was considering how my mum would've reacted and concluded I'd still be heating the ringing in my ears decades later from the clip round the ear!
I do hope that Mum had a massive bleeping bottle of decent gin and tonic in the trolley as well. It still wouldn't be enough reward for not ripping the entitled little rit's head off and screaming down the bloodied stump in front of everybody.