With regards to facts, if someone is disrespectful, I cannot respect the facts they present are indeed facts (unless of course one provides backup to their words).
I'm sorry, but that's crazy. You don't like how I say something, so you assume it isn't true without bothering to check for yourself? How is that sensible?
You have to understand the exasperation of scientists that leads to less than civil behaviour. To stick with the flat earth example, let's show a sample discussion.
Flat Earther: The world is flat. The whole round world thing is a conspiracy perpetuated by scientists and politicians who want to control us and destroy the economy by putting money into their pet projects. They're all liars and they don't have the evidence to back up the round earth theory so they make it up and try to shut up people trying to tell the truth!
Scientist: I'm sorry, but all of the evidence favours an earth that is roughly spherical.
FE: What evidence is that? People are always talking about this so-called evidence, but it doesn't exist!
S: Yes it does. We are able to travel around the world without falling off the edge, because there is no edge.
FE: There is an edge, but all the evidence about people falling off the edge has been suppressed by lying scientists and government!
S: (annoyed) That is a lie, there has never been evidence of people falling off the edge, because there is no edge. We have photos of the earth from space showing that it is roughly spherical, and people have even seen it from space.
FE: Lies! Conspiracy! Humans have never been to space, and even if they have, they're all in on the conspiracy!
S: (increasingly frustrated) What about satellites? You have SKY tv and satnav, those wouldn't work if the earth were flat.
FE: Satellites hang above the flat earth, all the stuff about orbits and things is scientific lies! It's just common sense that the earth is flat, when you look around it looks flat, I don't need science telling me I'm wrong when I can see it for myself!
(repeat above arguments endlessly for the best part of a decade)
S: WTF? Are you serious? That is ridiculous! Are you really that gullible?
FE: Haha, your evidence must be crap because you can't even back it up, you're just calling me names now!
S: OK, I'm not bothering to argue with you, you're obviously ignorant and pigheaded. Your viewpoint is so stupid that it doesn't even deserve the respect of a civilised argument.
FE: I win! Your rudeness shows that I'm right and your evidence is crap! Plus you and the scientific establishment are repressing me! You would only do that if you were part of the round earth conspiracy! Flat earth! Flat earth!
etc.