I agree. That was me once. I would leave comments the way I feel about the post. Now I have noticed people often agree with whatever the writer says just to be polite. These days instead of leaving an angry comment I stop reading the post and move on to the next.
But I do prefer people express how they feel free in my comments. I welcome all comments that do not directly attract me as a person but you can disagree with what I write and I learn if the person is right.