I'll ask this with the obvious risk of making a correlation: would you have the same opinion of kkkautoblocker — a tool that blocked anyone who associated with the leaders of a hate group?
My suggestion is that social networks ban users wherein harassment is strictly obvious, not wherein a prejudice opinion is even only implied. This is a tricky judgement call that the article tries to dissect, and unfortunately to which I clearly have little to contribute.
People should also consider that if they can't handle the vile cesspit that the internet is, using it is optional.
For another... if people you don't know are being malicious to you maybe you should step back and think about your public face. People who draw a lot of trolls do so for a reason.