Epictetus (b. 50 AD) was a Greek philosopher and authority on Stoicism. The main idea (as far as Rhinos grasp it) is that emotion should only be spent on things We can change in ourselves. Passion is often wasted, fretting about external issues.
In the face of Thundering Rubbish, We should calmly withstand disturbance. Deal with reality, and limit our involvement to Action. Where that is possible.
Rhinos are susceptible to flipping out, so Stoicism is a challenge. Still, knowing a bit about it is a beginning.