I've already pointed out that it is nearly impossible to differentiate between those that are trolling and those that are not. Being the thing you are satirizing is lazy and not funny. For an example, see this.
The creator of this game before it got pulled off Steam claimed that he was satirizing the people that hate the LGBT movement by creating a disgusting example of a game that is indistinguishable from the thing it is satirizing. According to your logic,
this is funny.
People at Sluthate believe in what they constantly preach yet pretend they're trolling so they don't have to take responsibility for the things they say. Its that simple.