I have had a tough week - not helped by what I consider to be total insensitivity by other people who surely should try to think before they speak.
As a single parent who works full time perhaps I am overly sensitive to these comments:
"You miss out so much if you work when you have kids"
"I would never send my child to an afterschool club"
"I want to donate DD's clothes to a charity so I have been looking out for a "single parent's hospice* I can donate them to" 
I never know what to say to these comments which really upset me so I just change the subject but I really need to find a suitable retort!