Just feel the need to have a little rant about double standards.
I have an 18 yr old dsd (as well as 3 other dsc).
I also have my own 16 yr old ds.
My dp has never really disciplined his kids. When his dsd was 16 she would literally lie on the kitchen work top or the sofa and refuse to even look away from her phone to communicate. She, always , however had to be in the same room as us and would follow us if we left. He never once pulled her on her rudeness, including family holidays where she refused to leave her room or open the curtains.
In the 4 years we have lived together, she has never had a friend round or been to a friends preferring to spend from 3.20 Friday to 8.45 Monday lying on the sofa grunting at us instead.
She has told dp that "I'm not walking anywhere" so whilst expecting all other kids (especially my ds) to walk home from school or to the bus stop etc, he never allows her to do so. And ensures he provides a taxi service.
She doesn't communicate with him through the mobile phone he pays for and regularly ignores him, so he rewards her by getting her a better phone.
She did as little as possible in school and would regularly boast to dp that she didn't revise or make any efforts. Again, he never pulled her on it.
Get the picture?
So my ds is being an unpleasant teen and quite lazy and a bit rude to me only. He just wants to sit in his room on the PC and play games and talk to his friends online. He doesn't want to be with us, is sullen and dismisses my suggestions of getting work or doing some volunteering. He was rude to me last week and I took his PC away and we have had a long talk about my expectations versus his wants and needs and I feel better about things and think I have to let him develop at his own pace.
He is, however , very focussed on his schooling, having ordered every university prospectus you can imagine despite being only 16. He says he can't wait to know his gcse results so he can start getting on with a levels. He also does lots of jobs around the house and keeps his room clean and tidy. He is doing some gardening today for a friend for some money.
So despite him being sullen, miserable and moody, I don't think he's all bad and try and see the positives.
I have given him a consequence (something dsc never see to get) for being rude and had a long talk with him. Again, dp excuses his kids behaviour and doesn't discuss anything with them.
So why does dp suddenly have do many opinions on "discipline". Apparently ds should never have his computer back, he should be made to walk up the road (ya know the same road his kids can't walk down) and buy me flowers and he should be made to do even more jobs at home as "punishment " for doing something his kids have regularly been excused for. 
I'm just ignoring him at the moment but I can feel I am going to explode soon if he doesn't keep his mouth shut!