I'm going to bail on plans with a sick friend
Is it because your friend is sick?
Yes, I hate being around the sick and cowardly.
You made the right choice, it is good to avoid sick people. If you hang around sick people you will get sick as well.
They should fight harder to get over the illness.
It's fine to avoid sick people who are contagious. But just because someone is sick doesn't make them weak or cowardly. You should be kinder toward sick friends.