I'm going to block my depressed friend
Are you going to delete all the old texts too?
Yeah, I plan on deleting the texts too if possible.
People who could be depressed could be downers for sure, but you should try to look at it from their perspective. They need support more than anything right now and it would probably crush them if you blocked them. Try to be more understanding of what they're going through.
I'm not interested in supporting them. I'll just block them.
Probably your decision of blocking them will make their situation worse. If you can't support them it's fine but you don't need to block them, it'll hurt your friend a lot.