in our apartment building you have to stop doing noisy shit at 9 pm on weekdays, but that means loud tv/movie watching, blasting music, working with tools, etc. weekends you're good til 10 or 11, iirc.
however, you can do laundry as late as you fucking want.
tell them to shove it. what if you work all day and only get home around 7? when the fuck are you gonna do your laundry? i don't know about you but there's a fuckin' line up on the weekends for our floor's machine. i always do laundry on the weekdays, usually until 11 pm. if the lady who lives beside the laundry room can't deal with that, she can kiss my ass. shouldn't have moved into that apartment, then!
we've got our own problem with the laundry room here -- people don't know how to fucking operate a washing machine/dryer. no one empties the god damn lint trap, and last week someone broke the fucking soap intake on the washer. how the hell do you break something like that?! was the guy trying to rip it out of the washer or something?
anyway, dcharlie is right -- if they have a problem they should be taking it up with your landlord, not bitching at the other tenants because they want to get their slice of reality tv bullshit in at the end of the day.