I completely disagree with you. Especially with this part;
It's attitudes like this that prevent people reaching out for help. Depression IS real, it's not just down to loss or tragedy. There are numerous scientific studies, one in particular discovered that the brain is noticeably different in people with depression than in those without. One study discovered that in 24 women with a history of depression, their hippocampus was between 9% and 13% smaller than those without depression. The more episodes of depression, the smaller their hippocampus got. That's a physical change in the physiology of the brain. Not all of those cases will be down to loss or tragedy. Scientific studies have also shown that there is a genetic link and those who have a family history of depression are more likely to suffer themselves. Depression is medically recognised as a symptom of some illnesses; thyroid disease, autoimmune diseases, vitamin deficiencies to name but a few. There is also beginning to be research into the possibility that depression can be linked to inflammation, a theory postulated by the psychiatrist Edward Bullmore.
Sometimes people who seem to have their life together and going great can suffer with depression. Considering that as not "real depression" completely negates and diminishes their experiences and could be dangerous if it discourages them from getting help.