I do point out others' faults if they are blatant and persistent. For instance, I do not tolerate the likes of those who consistently insist on controlling the lives of others. Mean spiritedness on a consistent basis is one of the faults I like to point out. Of course, that is not as mean as it sounds, because anyone that sees this kind of mean spiritedness will see it for themselves.
But, there are situations I do not like to point out. People do make mistakes. People are free to believe whatever they want: If people tell me that I am going to hell, and I know they are very religious, I simply argue that I don't give a fxxx and let that be it. And, if offenses were what I looked for, everything that everyone ever posted is going to offend someone--hence, if I wanted to avoid offending anyone, I couldn't post anything. This works both ways--and I know that, as one that hates God, religious people do tell me that I am going to hell for it (and once I was called "anointed of Satan" by a strong Christian believer). These things are really belief issues, and everyone has the right to believe what they want. Even if they are wrong.
Also, if someone is under stress, that could make them more likely to do something they regret later. Why add to that regret with bashing people for single mistakes that could well be because they are under pressure, say from their boss, to do more than they really should? Much of it stems from Plato--and, again I can trace that to what Jehovah Himself wants. This goes down from religious and political leaders, who protect bad CEOs from competition, and those bad CEOs take it out on the workers under them. That is often why many of them will be relatively rude.