It's not that blatant tho is it, it's what they normalise. Obviously it's only freaks who sit at home and go 'oooh i wish i was like craig from big brother' etc
but if you watch 'reality shows' and so on day in day out and talk about it at work it becomes part of how 'people go on' in your view. that's the whole point, they are just 'normal people' like you and your friends, so the way that you see them and their behaviour edited becomes a representation of normal behaviour. people don't copy behaviour directly from TV but things we see on TV do affect our behaviour, it's like how most people don't see adverts and go out and buy stuff straight away but they plant the seed in your brain...