It's such a shame that OP is unaware of optional dress codes on Informal nights.
On Informal nights, passengers may dress casual at the following restaurants - La Terrazza, Kaiseki, Seishin, and Silver Note.
Dress code is always casual in Hot Rocks and Spaccanapolli.
Just quit complaining.
You knew what dress codes were when you booked the cruise.
This is what makes Silversea different (better) than the competition.