Why do some Scottish still hate the English?

The same reason some Irish still hate the English. From around the 1500's up until World War 1, England was possibly the most powerful empire on earth. During that time, Imperial English soldiers, officials and citizens living or stationed in places like Scotland, Ireland, India and Africa treated the locals as being less than human. Especially in Ireland and Scotland, the English tried to completely eradicate the Celts, first by waging open war on them, and later by way of trying to breed them out of existance. The "First Night's Right" (as portrayed in the film "Braveheart") is a fine example, wherein English soldiers would have the right to rape the bride of a Scotsman on their wedding night, ensuring that the resulting child would be English.

With the way the countries interact today, the Scots' feeling of hatred are obsolete, much akin to how a number African Americans still harbor resentment about African slavery in the 1700 and 1800's

" African Americans still harbor resentment about African slavery in the 1700 and 1800's"

Actually it's more than that. If you look at the Civil Rights Movement which was VERY recent in terms of history (around 50 or so years ago) Blacks in America were basically treated like dirt. Ever major war that the U.S. has fought most Black WILLINGLY signed up,killed and sometimes DIED for a country that for the most part thought they were one step above animals. Thinking military service would buy them some respect they returned home only to be beaten and sometimes killed for being "uppity" Now since the Movement wasn't that long ago here in the South you can very well have the Black business owner and the Klansman who torched his business pass each other on the street. Now fast forward 50 years and you have the two a little older but still alive. Don't you think there would be more than a little tension between the two? Here is a Klansman who has not only destroyed Black lives but has lived to see not only Blacks who are now equals (which by being born EVERY human being is equal to any other human being) but a Black PRESIDENT. But yet he probably sees Blacks as the source of all evil. Along with all other non whites and all whites who are non racists. It's a lot deeper than this but it's a start. Contrary to popular belief(trust me I know) most Black people don't sit around complaining about what happened nearly 200 years ago. Although it is a historical fact we worry about the future and take care of business in the present. Just like anyone else.