Is confidence the same as rudeness ?

Rant-ish question: This is something I think about often for some reason, I try to avoid judging or being bothered by tones and certain ways of speech, but it eventually gets to you and makes you wonder

I really don't understand people who are rude for no reason, if we're discussing something, I like to keep things respectful between us even if we have different views, that is unless you're saying something completely nonsensical of course. I just get confused, if you have that much time to spend cursing somebody I'd personally just prefer to spend said time enjoying myself instead

I see this alot on this website too, people get so defensive and rude the moment you try to have a fraction of difference in opinions, do these people think they're superior and more intelligent being harsh? What is the correlation here, you can be factual and right without needing to pop a vein calling somebody an idiot or a dumbass or whatever.

I realize that environments play a role in how you act and speak, same for what you consume from literature and media, but I still think it's no excuse to be rude, I mean, every case is different and it's understandable sometimes, but mental challenges and disorders aren't an excuse for someone to go off on somebody, this is not to compare situations but I grew up in a very abusive and toxic household and I used to consume a lot of things I shouldn't have consumed, but I still grew up knowing that being kind is the least you can do to a stranger, in fact, because I grew up in this environment, I realize how much respect and decency affects the mood of people around you.

What do you think?