There's already enough people running around screaming about how people of such-and-such a rank are trash and should uninstall/get cancer/hang themselves/whatever method of torture or death the community is on about these days. there's no need to bring up rank and it just makes things bad all around when people do most times.
The only time I can see bringing up ranking being appropriate is when or if people can be understanding about the differences. For example, yes, in bronze division there's not a ton of usage of wards. We know that. We also know that compared to higher-ranked games, being in bronze or silver can practically be a different game. Champions are picked there that aren't viable in higher rankings, etc.
If we can drop the snobbish elitism towards ranks, then go ahead and put them in. But considering that I doubt we can, it's probably best to leave them out.