In my opinion grief is never insignificant. If it touches you to the point that it causes you grief then how can it possibly be insignificant? Calling someone elses pain silly or stupid only serves to show the dis-passionate feelings of others who think that. You never know how the other person is feeling, until you have stood in their shoes and felt their pain, no matter how minute and insignificant to you personally, so you will never be able to say that it doesn't exist.