i.e. dropping a one line post that says "lefties are snowflakes" is trolling. Making the same statement with a link to article provides an example of thin skinned behavior from people with progressive views along with an explanation on why you think that people should not get upset at whatever triggered the incident is not trolling even if the underlying message is the same.
I think the real difference is whether you're simply saying it to cause
**** to fly or whether you actually believe it.