When I was less depressed, I was able to join a local D&D group, go for bar trivia nights, etc. but as I became more depressed/anxious/stressed (coz of personal and professional situations), it became harder to push myself to become sociable and not get anxious around crowds.
So I think the main point that the parent comment is trying to say is that people need to recognize that problems that may seem to have simple and straightforward "solutions" (like "have you considered therapy") are significantly harder for some individuals purely due to other mental health issues.
I am not trying to fault you, but it is a thing I see in a lot of my friends/peers/relatives is that it gets harder to understand how different mental health issues affect different people in incredibly different ways.
Your advice (as well-meant as it may be) is exactly as helpful as the extrovert, mentioned by the parent, who gives the advice to "just have more fun". It's not a lack of knowing what to do. It's a profound lack of "activation energy".
The intervening period of time reminds me that I'm supposed to be in therapy, that I might need therapy, but am instead unable to see anyone. That makes my day-to-day life feel wrong, moreso than if I had never considered it as an option.
Over the years I have found a way to live my life in an OK manner. There are some things in life that aren’t accessible to me but there are plenty of other things I can experience that are rewarding too. I am lucky that my social anxiety and autistic traits aren’t extreme and I have enough intelligence to understand things. Other people have it way worse.
[0] https://en.wikipedia.org/wiki/T-groups
[1] https://www.edbatista.com/2018/06/a-brief-history-of-t-group...