Why do some people ask for an honest opinion and then get angry for an honest opinion?

You see I'm a straightforward, blunt person and I tell it like it is no matter how much it hurts. I don't sugarcoat shit. I hate when friends sugarcoat things and it irritates the hell outta me. Just be honest. I rather have someone hurt me very bad with the truth than comfort me in a lie because lies hurt even more. Don't protect someone's feelings just because they want to hear what they WANT to hear. Don't ask if you don't wanna hear the truth.