When you're blocked by association (just for being friends with someone) but weren't involved in a disagreement, how do you make yourself feel better?

I guess it depends on whether you had been friends with the person who blocked you or not. If you had known someone for a while, and don't understand the block, you could try getting a mutual friend to email them and ask what happened.

Otherwise, if it's a stranger who blocked you, I don't see why you would miss them anyway.