My DD and best friend also 5 are at holiday clubs together. I am taking and collecting all week.
Friend is a boastful child, my DD is cautious, doesn't like too much praise in case she can't live up to it, but is quietly confident in her abilities, so long as he can practice and master them away from an audience. Friend invites praise for absolutely everything, from putting her own seatbelt on to doing her coat up.
I absolutely hate it. At pick up yesterday, I asked if they had a good day, friend said "yes, I was better than DD at x". This morning she was telling me her mum worked much harder than I do, her kitchen is better, she can do x y z better than DD. Then there is the " Can DD do this, because I can and I bet she can't".
I have said repeatedly I don't want to hear it, everyone has things they are good at. I have told her parents, who say "yeah, friend, don't do that".
It is exhausting. My DD has learnt to ignore it and doesn't retaliate. I have to bite my tongue.
Anyone found a good way to deal with this?