OK, you asked, so I'll be honest.

The Confederate Battle Flag has been co-opted by racists, so that it now has racist connotations. The Confederacy supported slavery, which is immoral and unjust, and the flag represents that. The Confederacy lost the war and failed in its attempt to leave the US. The flag is a symbol of sedition and revolution. Had the South successfully seceded the US would not be the dominant world power we are today.

Plus its an ugly, gawdy flag.

Do you guys think people should be allowed to show it on there cars/ homes etc I do but apparently some don't
The great thing about the US is that people can fly whatever flag they want.

ichi