I agree with this. I've found that in order to maintain my relationships with some good friends, I've had to stop following them on twitter (and other social media).
On twitter, it's really easy for my to ignore all the insane and stupid things that complete strangers blather about on there all the time. There's a ton of noise, but just enough signal for me to check in regularly.
But then suddenly I see a ridiculous post from someone I truly care about. Someone who I've known for years and know their spouse and kids and families. I can read their post in their voice as if it were said to me, personally. And now I'm angered and incensed and putting up maps and charts and pins in my head preparing a response that this person whom I care about deserves.
But they weren't talking to me. They were shouting something crazy into a cacophony of crazy strangers. If we were at dinner we would have a long, deep, and nuanced conversation on the subject and we'd listen to each other's points and respond accordingly. But in 240 chars they're wrong and now I will reserve two hours of mental capacity to argue with myself about why.
Nope. Just block them, knowing I'll see them next time they're in town, and we'll have a real conversations about real things in a forum more befitting two people trying to understand each other.