A very detailed source on family income, food, all other expenditure and outcomes in terms of child mortality, in working class families in Lambeth in the Edwardian era is 'Round About a Pound a Week' by Maud Pember Reeves.
In that case, men were certainly given the 'treats', termed 'relish' like a bit of bacon with their breakfast, or some fish with dinner. They were given more food and feeding them enough was a priority, because the family income depended upon their ability to work, mostly not in heavy manual jobs but they worked long hours and many walked miles to and from work, so were at home only to eat and sleep.
Children and women did next best and there was a lot of very basic food e.g. bread and marg, bread and dripping. (There's a whole section on how the do-gooding researchers tried to persuade them to make porridge, as a more nutritious, cheap breakfast - which explains in detail why it's not actually cheap or easy if you've no milk, only one pan and limited fuel and water).
The charts plotting various results are fascinating. What stands out is that the factor correlating to high infant and childhood mortality is quality of housing. Cramped, windowless rooms allowed infectious disease to take hold more easily. Families who prioritised better housing over funeral insurance, clothes and even better food, had better survival rates (that's a very crude summary).
The other really interesting and resonant thing about the book is that it was an investigation into the truth behind the governing class's ideas about how the 'only just managing' WC spent their money. The stand-out result was that the men were a lot less selfish than people assumed.
There was an assumption that WC men spent lots of money on drink and could easily afford more comfortable lives for their families if they just managed their money better - in part based on comfortable MC people doing 'living off minimum wage for a week' style experiments but failing to account for their pre-existing capital, like nice housing, clothes etc. In fact, the men barely drank at all, at most once a week, as they handed over the bulk of their wages to their wives, who then budgeted extremely carefully.
So in that case - and it was a very carefully selected group; no-one in desperate poverty, or with a higher than 'scraping by' wage - there was an accepted level of selfishness amongst men (e.g. if they gained tips through their work they'd keep them for treats and drink, even if they amounted to 5-10% of household income and could have made a difference to the family budget, shoes for a child, pay off short-term debt etc). But, what really comes across is that everyone worked relentlessly hard and did so for the whole family.
So, while I don't doubt the sense of the OP and would be interested to see other examples from other times, places and social segments, the lived reality hasn't always been at he worst end of the selfishness scale by any means.