"I like the color blue" is an opinion. "I do not like the color blue, and do not want to wear it" is an opinion. "The color blue is wrong, it's destroying society, and we should melt down all blue crayons and whatever colors are to the left and right of them in the box to purge this disease from our society" is not an opinion. I am inclusive of those first two. The third I will meet you on the streets with fire and steel to drive you out.