Given that I assume we're ignoring the rude person...
CrumpetQueen while I don't agree with your OP - ie YABU the person you should be annoyed at is your DP for taking the advice of randoms who have no clue about your home life, and refusing to help when you need him, no need to get all aggro with the randoms - YANBU to expect your DP to support you, and if his work/commute wouldn't be affected by a rough night then he should pitch in.
As it happens, DH and I agreed he only helps at night in extreme circs, he drives an hour to work, has a v physical job with heavy machinery and does not cope without a reasonable amount of sleep, accidents will happen. He helps at the weekends, but work nights I try my best to let him sleep.
Some of my friends DPs/DHs have desk jobs and a tube commute - they could most definitely take their turns, and they did, to suit each couple's circs.
The point is - every couple are different, there is no hard and fast 'rule' that will work, so the randoms should have kept their beaks out, and your DP should have just told them to jog on.
I did "Ha!" at the comment on the first page saying that a SAHM "can sleep when the baby sleeps" tho - yeah right! I'm sure some can, but that happened maybe once a week tops with DS.