How exactly to you (general) expect to be warned that you may see something you don't like on Facebook? Even if someone said "warning! I'm about to post a picture of grandma in her coffin." FB doesn't exactly arrange everything in the right order. If you are so sensitive to certain things that you can't scroll by or hide a news feed without it ruining your day, then maybe the internet (and TV) isn't for you. You need to take some responsibility for yourself...for example if spiders make you sqeemish you need to take steps to either avoid pictures of them, our deal with the fact that spiders exist and you won't be protected from them forever. Same goes with funerals and the deceased. Expecting everyone else to protect you, just sets you up for disappointment.
I don't think a warning is the way to go. I think not posting at all is the way to go. I don't understand the argument that I should just get off the internet completely because I don't want to see what I think is a pretty macabre sight.
I do take steps to protect myself. I don't choose to go to websites where I'm likely to see a dead body, and I think that FB should be such a place.
Your talking about someone lying in a coffin. I don't necessarily love seeing pictures like that either, but calling it macabre is a bit much.
And I just don't think that you can blankedly say what is and isn't appropriate for other people to post on their walls. If it's legal and allowed by the site, then your particular feelings don't matter. You don't get to dictate what other people choose to share. All you can do is decide that you don't want to look at it and move past or hide the feed.
For example, I was extremely upset at the news that 20 children were killed just before Christmas at their elementary school. Like so bothered, it made me cry...a lot. I was disturbed, upset, and had bad dreams that the same thing would happen to my child. I would venture to say that I had the strongest reaction to that news than most anything else that didn't directly affect me. And I know that there was an entire nation of people that reacted the same way. And where did I first find out about it? On FB. Because people were posting the news stories, pictures of crying children, pictures of devestated parents. I wasn't exactly prepared for any of that when I got online. But, to go so far as to say that it was rude of my friends to post their thoughts, pictures, etc on their FB page is absurd.
You might attempt to argue that it isn't the same. But it is. It was an unpleasant thing that I didn't enjoy seeing at all. Definitely more disturbing that a friend's mom lying peacefully in a coffin.
You don't have to stay off the internet, but really, you do need to accept that life isn't always pleasant and when you are on a website where people are openly sharing their life with others, that those unpleasant things might creep in...to include, the perfectly normal (even if upsetting) practice of taking pictures of deceased and displaying them.
I've hidden feeds of perfectly good people before because they continuously post things that upset me in some way. And even if I did agree that it was rude to post a picture of someone in a coffin (which I don't), my advice would be the same. Ignore it and move on.
**All you's are general***