Raging is synonymous with basking in the sun, although it's much less messy and much less like basking in the sun.
When to Rage
It is acceptable to rage anytime you are feeling like a squashed potato, whatever that may mean for you. This is most often the case after you get trolled.
Final Summation: Now that you know what it means to rage, feel free to kill yourself. But only if you want to.