It's not very lazy, its a truth.
Rowing clubs cost money to join and trainings require extensive amounts of pick ups and drop offs at different times. Being able to get into a high performing school because of your rowing prowess is not a way of encouraging working class children.
" There are a ton of working class kids who are very sporty and where there is a will, there is a way"
Have you ever considered why the only sports in which private schools are not massively over represented are the ones where you don't need specialist equipment etc to do? Private schools are massively under represented in football for example.
" Where I live our local music trust has been working very closely with primary schools to identify gifted kids with a good ear from an early age to then offer them free choirs and music lessons and free hire instruments in schools."
Anecdata.
"This is why immigrant kids are overtaking British born kids who are being told to stay in their class boxes. You need to get out of that kind of thinking and embrace aspiration."
Actually, immigrant children are significantly more likely to live in London which has benefitted from the London challenge and has larger proximity to economic opportunities than elsewhere. This makes a BIG difference to the data, as so do white working class ( actually white children on FSM) children.
Its also a very poor sweeping generalisation, children from migrant backgrounds outside of London don't all flourish.
Stop pretending that programs designed to benefit the middle classes are designed to benefit the working class.
The stuff about "aspiration" is also guff.