@Servant of the Lord
I pointed out the same things on a youtube video. I pointed out that history tells a slightly different story than what every one offended is arguing. History shows the Civil War was from 1861 - 1865, it also shows that Lincoln himself stated the war wasn't about slavery, rather it was about getting the south to rejoin the union. History shows Lincoln even stated he had no interest in freeing the slaves (which the south didn't believe and still broke away from the union). Lincoln didn't threaten to free slaves until September of 1862 (Emancipation Proclamation) by stating the slaves in the south would be freed if the Confederate states didn't rejoin the Union by January 1, 1863 (which the date came and went). On that day he freed all slaves in the south, but the slaves in the north weren't free yet. The union armies did allow African American troops after this point, but all wouldn't be free until the end of the war in 1865.
As for the flag, the flag originally started out with 13 stars to represent the 11 confederate states that seceded the union and the two that were confederate states, but didn't secede the union. Ultimately it looked too similar to the Union flag, upon which a General requested it changed to avoid friendly fire between his troops. As pointed out it has undergone several changes through the years, but personally I think pinning slavery on it is pushing it considering both sides had slavery. Same with segregation. The only valid connection in my view is it represents secession and nothing else.