What does it mean?
dismissing the concerns of a genuine depression sufferer

I’ve said it before, and I’ll say it again; dismissing the concerns of a genuine depression sufferer on the grounds that you’ve been miserable and got over it is like dismissing the issues faced by someone who’s had to have their arm amputated because you once had a paper cut and it didn’t bother you. Depression is a genuine debilitating condition, and being in “a bit of a funk” isn’t.

Question

What does it mean?
dismissing the concerns of a genuine depression sufferer

I’ve said it before, and I’ll say it again; dismissing the concerns of a genuine depression sufferer on the grounds that you’ve been miserable and got over it is like dismissing the issues faced by someone who’s had to have their arm amputated because you once had a paper cut and it didn’t bother you. Depression is a genuine debilitating condition, and being in “a bit of a funk” isn’t.

Answer

Which particular language points do you not understand?

Answer

If you dismiss someone's concerns, you minimize them, or treat them as if they are not important. In this case, the author is making a distinction between a person who has clinical depression and one who is temporarily in a sad mood. The author is saying that someone who has only experienced temporary sadness shouldn't tell a true depression sufferer just to "get over it".