When you're depressed (or anxious, or triggered), staying in all weekend, not answering the phone, binge-watching TV, and not getting dressed sounds great. It might even sound like "self-care." And aspects of it can be self-care. But self-care is not just about soothing yourself in the moment, it's about setting up the supports and structures that let you be okay enough in your day-to-day life. So while depression says "let's watch Buffy instead of doing the laundry" the reality is that tomorrow you're going to wake up to clothes everywhere, nothing clean, and one more thing you haven't done–which will add to the guilt and shame that seem to come hand-in-hand with depression.
On the other hand, depression-challenging behaviours are hard and not fun in the moment, but set you up to a) have small victories (SO important when dealing with mental health issues), b) have some structure and routine in your life, and c) set up the support and structure to let you deal with the root of your issues or cope with issues that aren't going away anytime soon.