>Making yourself an opinion of someone despite never talked to that person
Save yourself your own opinions before being influenced by anything. Do you own damn research.
You can chose to believe a source, or not. We all want to be right in any case. The key relies on how far you'd go with that info.
If your opinion about someone changes just because of some text, and not by interacting directly with that person, then clearly you need to reconsider it.
Furthemore, if you don't know that person deeply you can't just make yourself a bad opinion, that's fluff.. Of course, if you hear bad stuff and you see bad stuff and that bad stuff happens to you, then you can make an opinion, but even so, it doesn't mean that your point of view about someone is right.
You don't know if the person you had a bad experience with showed you all it's personality. But we have to assume it, because you want others to know your personality, you want them to know how to react to you. So technically, you shouldn't hide yourself. Be yourself, and others will react to you for what you are.
Noone is perfect. If you believe someone is perfect you're wrong. They're not. We all have flaws. We all have certain issues with ourselves in some way.
If you have a "perfect" point of view out of someone, you'd be surprised and dissapointed once something doesn't go as planned related to 'em. Either, using some suffix to classify that person (Oh that's an angel! They'd never do something sketchy! It's a demon, don't trust it!) is dumb.
You can argue that certain ppl are bad by design, or you really know they're bad. That's true if everything points to it, but it still might not be 100% true. You'd never know.
For that, you should stick to your own opinions, and don't let yourself be 100% influenced by a external factor.
Yes it's way too easy to 'believe' something, since the info is just thrown at you and we are usually too lazy to do our own research.
Ultimately, we have different approaches to conflict, some ppl just have aggressive approachs, and chose to just fight/send threats or whatever without trying to understand completely the situation or trying to fix peacefully. Others are in the middle ground, but have little patience, or just being influenced and forced to chose a side. And last are those that try first a pacific approach, ways to solve it, give hints, wait out a long time before taking another approach to the conflict. Yes, being 100% 'peaceful' doesn't work everytime, except in some cases, as well as being 100% overly aggressive doesn't work all the time (And it work less). Finding a middle ground is neccesary, as with human nature, we need to solve conflicts, and not always things end up being as expected.
In any case, we should try first a peaceful approach, even if the thing seems hostile from your point of view. Just a tiny bit, if you're not peaceful tho, you'd just escalate the situation for no reason. And by peaceful I mean that you try to understand the things, and not outright accuse others, specially if you're not directly involved.
As a society, (Or for me, at least) we aim to reduce the level of aggresiveness to an acceptable level, (Current human mind doesn't allow for utopian societies). I try to help the cause by having a certain, more open mindset. Doesn't mean that personally I am flawless in the term of public relations, noone is.
We make mistakes, we learn. More importantly we can't learn without making mistakes, and sometimes we need more than one mistake to learn, it's on the brain.
Last question would be if you, you as a person, look to improve your own points of views by being more open, not closed and conservative. We need to learn to forget & forgive, not having permanent grudges.
That's my opinion.