I don’t believe anyone was saying not to seek help when neccesary.
However, feeling down at one point does not mean that professional help is neccesary and doing something cheerful can work fine. M
It is when the depression is lingering or interferes with leading life, even if it feels that way that outside help is warranted.
But a suggestion to do some something calming or enjoyable is not the worst advice ever.
And it is arrogant to make such a comment.
And I am not talking without having known people who were suffering mental illness and needed professional help.