Some people are just different to you and gain pleasure in different ways.
I like to take pictures as reminders and use facebook like a diary, you use it your way.
I don't think you are jealous, but I do think your judgement is unnecessary. If you don't like it hide it or delete the person, it's your Facebook so make it work for you instead of coming over to another website to bitch about someone who is supposedly a "friend".
It really upsets me to think that people are really this horrid about something that is just personal choice.
It might seem inane to you but when I see something I like, I take a picture, whether it be food or a tree or a vista or whatever. I can't picture in my head like some people do, it's to do with the way my brain works, likely HFA. I don't moan or bitch about what anyone else does with their time, because even with my social difficulties I recognise that we are all different and thus behave so.