Because the meme is clowning on the racist. You realize most racist people are in your party. The ones that wave this stupid flag also wave the confederate flag because they're racist! So, that triggered you and you felt the need to say I create hate and division while simultaneously defending racism. Now if you had said I agree no one should be treaded on regardless of skin color but not everyone who haves this flag is racist then you may be arguing in good faith, but not really. When you call someone hateful because they are against racism then you are defending racism. It's the old "I know you are but what am I" tactic that al fascist use.