Social hierarchies are a cancer but the only way that the short comings of arena payouts could be addressed is by CG reworking the whole thing which inevitably lowers rewards because that's just what they'd do.
On the one hand shard chats are great because it lets players work the system more efficiently to get more crystals overall.
On the other hand a player will tend towards being inherently selfish, protecting what they have, their own payout and the shard that works for them, providing motivation to bully newcomers back out of the social barrier that they have crafted.
A lot of the time this results in systematic harassment which should not be allowed but is impossible to counter with how the game works. Unfortunately you are only left with one option which is the following summary,
Tl;dr git gud