I have seen several websites where a bad 'like' status of let's say -5 hides the post. Users can click on the one line notification of the hidden post to reveal it. (works like a spoiler but this hides the whole post including member info, signature, etc).

not sure if this can already be done, but would like this for sure and shouldn't be to hard to code I guess.

A post shouldn't be hidden just because a few people disagree with it, in my opinion. What you ask is fairly easy to code though.

If negative reputation is enabled, this does exist. There's an option to choose post threshold, and any below that will be hidden unless you toggle it. I think the default is -10.

I thought I saw that option somewhere, but now in 3.3.2 can't find it anymore. Can you remember where you have seen it?

By the way. You can see how it works here: http://tweakers.net/nieuws/81728/windows-live-merknaam-gaat-verdwijnen.html
Check the replies on that Dutch topic, also notice the color of the icon right of the replies.