This is a contradiction. Either you believe the action is ethically superior or you don't. It makes no sense to believe it's ethically superior except when you do it. I would very much hope you believe you're doing the right thing.
I think you're confusing the belief that your actions are superior with the action of being a dick. They're not directly related — it's just that the latter is likely to reveal the former.
Is it impossible to think that something you do is a more ethical thing to do than something someone else does without a.) judging the person who isn't doing it or b.) at least thinking that their decision not to do it is wrong?
Sure. It's more ethical for an self-professed alcoholic to not drink, as their alcohol consumption likely affects others. That said, it's easy to not drink alcohol and not judge others for drinking it.
That said, do that too often, and you're just around a bunch of annoying drunk people...
I think you're confusing the belief that your actions are superior with the action of being a dick. They're not directly related — it's just that the latter is likely to reveal the former.