Something I've been thinking about is that changes only happen organically, so I think it's good to not be an insistent advocate for a platform X, Y or Z. Instead, I think that perhaps it's better, instead, to simply use the platform the person is more favorable towards whenever possible, and if people then share something worth sharing, it should slowly bring people over. And regarding the annoying part, at most, making a note about technicalities and the type of people in the site could be good if discussions the person is engaged in allows, and if the person didn't burn people's patience by being pedantic.