And segregation wasn't offensive to most southern whites. Your counter argument is silly because you could use it to argue that nothing is offensive.
Does racial segregation offend you, then? If so what are you actually doing about it? Are you putting your kids in a diverse school? Are you encouraging them to date people from other races? Are you married to one currently? How much of your social circle, other than acquaintances, involve non-whites?
There is no way you are going to "fix" societal issues without demonstrating a resolution in your own life.
Offensiveness is a function with two inputs; it depends on both the thing and the person in question.