Constructive Criticism

Diana • Married to the man of my freaking dreams.
Why is everyone on the internet so butt hurt when it comes to constructive criticism? 😂
Like I understand if someone is making a comment simply to insult or put down somebody it's not okay and it's always great when somebody else intervenes;
But why do people feel the need to intervene when you respectfully give someone advice that could actually better or improve whatever the situation is? 
How do you give constructive criticism to avoid having angry or offended commenters?Â