...TNG (as much as I loved it) sort of suffered from this air of smug superiority where Picard was constantly lecturing aliens and insisting that the Federation (and humanity in particular) had evolved more than the rest of the Galaxy.
Well, the aliens-with-issues were supposed to represent our current society with its current social ills, and Picard and the Federation were supposed to represent an ideal that we humans might one day achieve...
...but yeah, Picard and the others just came off sounding like smug elitist jerks much of the time.
It would be like me proclaiming that my grandparents' generation often promoted racist attitudes while I, on the other hand, am enlightened and of superior morals.