I don't know what to think about this

Last Sunday we went to the movies 'cos my parents wanted to see "The Queen" movie, after the movie we had dinner in a restaurant and my brother arrived there 'cos he didn't accompany us to the movies, however when we were on our way home I travelled with my parents and my sister with my brother.
My mum wanted to put a CD on and my dad said "Please don't choose CD #3 'cos it's Floricienta's album and I can't stand her, she's annoying", this was surprising for me 'cos "Floricienta" my sister's favourite telly show and each and every single night we watch it (even thought we've seen the 2 whole seasons in the past) and my dad is also there to watch it and he's always like "Oh yeah it's a nice show, we'll miss it whenever they cut it off" so waht I find weird about this is that he doens't really like it but he says it's a nice show when we're with my sister and that's quite silly 'cos my sister doesn't care if my dad likes it .. but why does he have to be like that?!

Also the guy who asked me to forgive him after 2 years (I posted about this recently) told me that he really hadn't found someone true like since he got mad at me 'cos all of his "mates" were shallow and "twats" so he couldn't share his life with them and blah blah and in a certain way I believed in him 'cos I know those guys but surprisingly today I was listening to one of this conversations with one of his "mates" , my seat is infront of his seat in the classroom, and he was talking about one of his realtionships and how sad he was feeling ... so this shows me he was trying to recover my friendship one way or another.

I don't really understand why do people lie when they don't really need to do it, I think it's really annoying 'cos in the case of my dad, even if it sounds rude, no-one cares if he likes this telly show or not so he doesn't need to say he likes it while in reality he can't stand it and in the case of my "impossible" crsuh (haha) he doens't need to tell me he hasn't found someone to share his life with 'cos he ceratinly talks about it with some of his friends, and I hate it 'cos when we used to be good friends he used to be like that.. he was always saying nice things just to make things better even if those things were not true :S (I never moaned about this with him 'cos I was a bit blinded by olve)