No they pretty much just say, " don't argue with me or you can't play your xbox or computer." Which brings up another thing.
They take my (yes it's mine, I bought it aftter saving up for a year) xbox away/computer, which is kind of... lame...
You paid for it,but it's their house,their internet,their electricity..they have every right to,as your parents,take away any thing they want regardless of who paid for it.
Yes it can be unfair if they take it away,and I'll admit it does seem strange they're imposing all these rules without giving a reason-but you should just accept that they're your parents and they're likely doing it for a reason they think is good.
I'd say sit down and ask nicely,no "THIS ISN'T FAIR!!@!@!" stuff,just nicely ask why they suddenly decided on all of this,don't argue or complain but just ask.
Wait a week or so though,just go with the routine and settle in a little before you start asking questions.