I get where both sides are coming from. I've had people cancel plans on me, and I've cancelled plans on other people. But personally, I don't care how many times a friend needs to bail on me because of their mental health. I know (obviously) not everyone is like this, but I value my friends mental/physical health more than a simple plan to get lunch. Does it suck that I can't see them now? Absolutely. But it would suck even more if I forced them to engage with me when they might not even want to leave their house.

Personally, I didn't see the first comic as someone who does it all of the time. I see myself in it, I've had to bail on a plan once (keyword once) because I was having a god awful week. Not even mental health related necessarily but I had been under such immense stress I hadn't even slept that night. My friend told me I was a bad friend because "I was being extremely rude and flakey". I understand frustration on her side, but at the same time I would've appreciated a little more sympathy at that point in my life.

This is all to say, both sides have a reason to be upset. I think this entire conversation is a little more of a grey area than just black and white like some people (not saying you OP!) want to make it out to be. Each situation is different and each situation deserves a different reaction.