It does not even need to be a majority. Actually doing it makes you more believable when you promote any sort of action. It also works as a sort of promotion in itself. As in people can see you cycle, not eat meat or have solar panels on your roof. By doing it, you also create demand for the alternative, like for example solar panels, bicycles or vegan products. That makes those alternatives easier and cheaper to purchase. It also makes it politically easier to ban something, as part of the society is not impacted at all.

In the end calling somebody an idiot, for promoting individual action due it not being an attempt to change society is just dumb. After all anybody who does that promotion tries to bring other people to do something. At that point it really is no longer the action of an individual. Honestly it really is a simple way to lobby against such actions on a bigger scale.