Whats the diffference between sitting on your btm trawling through an internet forum to watching tv?
You are still sitting doing nothing.
I can have the tv on and still get plenty things done, but if I sit down at the pc then I am done for! The time just flies past
My kids dont actually watch a lot of tv, they prefer their consoles (time limited!) BUT I am the adult and what I do during the day when not working is my business not theirs. As long as I still do the housework, washing, shopping and feed them etc who cares? Plus I can catch up with any NCIS that I missed 
I tend to watch more tv during the day than at night (well not Jezza!!!) as the good programmes at night are few and far between.
My house my rules. OP's house she can make up her own rules her mother doesnt live there 
Remember that daytime TV is mainly aimed at the less productive members of society (I'm not saying "worse" members of society, but the ones who genuinely don't have anything better to do during the day), be they unemployed, disabled, elderly or just plain lazy. It has to be relatively cheap because of the lower viewing figures and consequently the lack of advertiser interest (there's a reason that there are so many adverts for injury claim lawyers, life insurance and so on).
Oh get lost, I can do plenty during the day/evening while still managing to watch some daytime tv. You do know that people work shifts, or may have days off during the week dont you? Lifestyles change over time, thats a pretty ignorant and patronising thing to say in 2016