Being distant/bad son?

i get on fairly well with my mum, i love her, but we don't really talk about much, talk about work, talk about trivial stuff basically, we also have completely opposite taste in pretty much everything, no similarities in TV and film, she spends all day watching the alibi channel, law and order, criminal minds, rizoli and isles, castle etc and maybe it's because I had to sit through that stuff when I was younger but I can't think of anything worse to sit through, painful dull tedium

So I spend most of my time at home upstairs watching things I want to watch on Netflix, when she comes home from work I'll go downstairs and ask how her day was, we'd talk for maybe 10 to 15 mins and then I'd go back upstairs, apart from walking past to get drinks etc that's all we'll see each other for that day,

If I'm cooking my own food I'll eat upstairs, I'd rather eat to a show I like or during a film than watching the same episode of some detective show that makes me want to smash my head against a wall, if she cooks I'll stay downstairs for a bit after, other than that we just do our own separate things
But just now I cooked off my meal, started to go upstairs, I've just got a new video game and can't wait to play it, and she moved her legs so I could sit down and asked if I wanted to watch the James bond skyfall, I've seen it three times already and said so, went upstairs and now she's upset because of it
It got me thinking, Is she being overly sensitive or am I being selfish? I get that you can't always just do what you enjoy in life it I've been watching the sort of shows she chain watches since a kid and they make want to gouge my eyes out, after sitting downstairs watching them with her it actually makes me lathergic, I get grouchy, I loose interest in something I was looking forward to, on the other hand I feel like I'm being a dick by not spending much time with her, so am I being a dick?