This movie was very racist

But how is it "wrong now"?

And it was set in even earlier times (same "double nostalgia" as with "Song of the South", and the non-rqcist "Wizard of Oz", same studio (MGM), same year (1939) as GWTW. After all, a LOT of period piece films were done way back when..Heck, Birth of a NBoriton itself, and aside from race, Disney fairy tales were already throwbacks, either way, just enjoy it for the product of eras, same with long gone pop culture references like old time radio, trolleys,etc.,etc.,etc.

"Of course it's wrong now"

Of course it's not wrong now, and wasn't wrong in 1939. It depicts black people who were slaves, and who were also good people. It depicts white people who owned slaves, who were struggling with war and a traumatic change in their culture. These kinds of people and this situation actually existed.

I'm sorry, but which bad ideas?

There is that brief part about "the time of the master and the slave" right at the beginning, that makes a lot of people today go "WTF did we just read?" You have to remember though that in 1939, many people in the South still believed that slavery had been a good thing even for the slaves. That will of course not work today though.
But other than that, this was actually a progressive movie for the time
That is very much lost on many modern viewers though, since such a long time has passed since then.
All of the black characters were played by actual black actors and not by white people in black-faces.
There was never any use of the N-word, despite what you might have expected from a movie about that era.
The KKK wasn't given a positive portrayal either, like I hear that it was in the novel.
Also, the actress who played Mamy was also the first African American to win an Oscar.
Thus, I don't believe that anybody who says that this movie is "racist" really knows a thing about it.

Watching it for the first time in about 10 years. The only negative thing I can say is the happy sounding song of Dixie is not what should play when people find out a bunch of their loved ones were lost at Gettysburg. But other than that it's good.

I think many films being made today present a whitewashed, romanticized view of different scenarios or time periods that is far from reality. It’s called FICTION. Gone With the Wind is a work of fiction.

You seem to forget that this movie was made in 1939 and is set in the 1860s. It is not fair att all to expect the story to be politically correct by our standards.

And what is your suggestion, really? Do you want to censor and ban every work from past decades and centuries, that is not okay with some people today?

A lot of things you mention are incorrect. Only a small part of the movie shows "the old South": most of it is about the post-war period. "we the people will rise again" is a misquote: you are probably referring to Scarlett's line "As God is my witness, I'll never be hungry again" which only refers to her own situation when she is at her lowest. But even if you were right there is no reason why the south's desire to recover shouldn't be a motif in a piece of fiction. You seem to want this movie to be something else than it is: that is kind of missing the point. Again: GWTW is a work of fiction and not a documentary. The book was meant as a romance story against the backdrop of the civil war and that is what most of the movie is also about. The movie may contain things that some people may find insensitive or "dated" but it is certainly not racist. Finally I must say that the way in which you seem to judge fans of the movie is irrelevant: everyone should make up their own mind. You have your opinion and other people have theirs. If you can't respect that then you are not going to convince anyone.

"horribly racist" is way too strong a description. "dated" and "insensitive" are much better descriptions. People use the word "racist" too much. Because of it there is the risk of not getting any response to it because the most minor things are deemed "racist". That wouldn't be good if you ask me.

Anyway: it is clear that a movie like this wouldn't be made this way in this day and age.

Actually, the movie was progressive when it comes to racial issues when it was made back in 1939.
I explained it in more detail in a previous post.