I'm going to block a friend of mine on social media.
Why would you block your friend on social media?
Because they're sick and they talk about their illness everyday.
I'm sure you're tired of hearing about your friend's illness but they're going through a difficult time and they need your support. You have to show kindness and support for someone that's struggling with an illness. Speaking about it is how they cope with it.
Nah, I'm going to block them and make them hate me. It's better for them to hate me for doing that than for listening about their problems.
One of the important parts of being a friend is supporting them when things aren't going well, like when a friend is sick. If you want to maintain any friendships, you need to be willing to deal with the bad as well as the fun times.