I tend to be the same.. there are plenty (actually lately, a heck of alot) of things or ideas that make me think

or

or

or "wow that person's a bit

" or just plain
I have learnt that it gets nasty very quicly, and there are some things and yes, as simsam says, everyone has their opinions, and while no-one means to push them, it takes one person to insult the idea of someone elses opinion for it to turn into a kind of "well i think this" "well i think that" "well, if you think THAT then you're wrong" Not often, but i have noticed it a bit more lately.
I do like Fleurs quote above.
I tend to usually read the first post and a few replies and mostly just think "ooooh, I'm not even going to justify joining this at all" I don't even go back and read it, I don't need to see everyone clambering with opinions to see who comes out on top.