While the Bible remains silent as to why, even the extreme case that led to shunning in 1Cor, not everybody in the congregation shunned the man (2Cor 2:6). It's my opinion that some in the congregation didn't know the details of the man's private life, they had no first-hand reason to shun him. Withdrawing "Christian love" because some 3rd party makes a vague statement on the platform is hardly Scriptural. Shunning someone over a "through the grapevine" accusation is a common JW activity, but hardly a Christian one.
What that man had to do to warrant being shunned was egregious (1Cor 5:1). Meanwhile, many things treated as "disfellowshipping matters" have little or no Scriptural grounds for even being wrong; much less outlandishly wicked and requiring ostracism from the congregation. Disagreeing with fallible men over their papal decrees (for example) is hardly addressed in the Bible as being a reason to expel someone. 1Cor 11:17-19 actually indicates doctrinal divisions are not inherently bad. One would be hard pressed to find Scriptural evidence that standing for truth rather than submitting to a lie is wickedness or a mental disease.
I gave up caring what these people think of me very shortly after becoming associated with the group. It doesn't say much of one's self-esteem to be overly-concerned about what these floor sweepers think of anything. Their ignorant, arrogant, stupid opinions are worth about as much as their retirement accounts: zero. I find myself saying this a lot lately, but I feel far too few people realize it: JWs (and most other cults) consist of power-hungry sociopaths and the doormats they abuse. Being a typical, mainstream JW is merely a symptom of a greater mental/emotional problem. If you find yourself crying over what some ignorant blue-collar loser in a cheap suit thinks of you, chances are you need to fix some things about yourself.
Get an education, get a good job, improve your life and your situation. Feel good about yourself, so you can be in the right frame of mind to deal with abusers. The Kingdom Hall isn't the only place you'll encounter nut jobs and you really need to know how to deal with them wherever you find them. A family member, coworker, boss, spouse, "friend", or anyone else with the mental/psychological makeup of a sociopathic elder, "elderette", or wanna-be elder will make your life miserable if you let them. Learn how to stand up for yourself and realize they don't matter. They only have the power over you that you give them.