Because for every woman coming on this site making a lighthearted joke about how her DH cannot do the laundry who doesn't mean it, there is a woman reading threads on here with a lazy/abusive husband gaslighting her telling her that all woman do the laundry and she is wrong to expect him to do any, and comments like that may make her feel like her partner is right.
Because for every woman coming on this site making a lighthearted joke about how her DH cannot do the laundry who doesn't mean it, there is a woman having to do all the laundry because her DH refuses and she can't be bothered to argue any more because its normal isn't it, after all other women laugh about it on mumsnet so she must be wrong to resent it.
Because for every woman coming on this site making a lighthearted joke about how her DH cannot do the laundry who doesn't mean it, alongside them are MRA's posting the same things to encourage women back into their little neatly defined 'feminine' boxes because they don't want equality.
Because for every woman coming on this site making a lighthearted joke about how her DH cannot do the laundry who doesn't mean it, is a mediocre man who thinks its okay not to do the laundry because even women say men can't possible understand how to do it.
Because you might not like to believe it, but if you were ill enough that your DH had to carry the laundry downstairs for you, but you were still expected to press the buttons (as you yourself have stated) then you are married to a man who does not respect you.
This is not normal behaviour, regardless of how many hours your DH works. Good husbands who respect their wives are capable of doing the washing, even if its normally the wifes job, when their wife is ill without expecting her to drag herself out of bed to select the programme and press go.