Redditism 1: "It's the internet. You are allowed to swear." 
I hate when some very grown-ass adult says that because someone didn't cuss enough for their taste. I swear all the time in my posts here but I still find that shit really, really tryhard and it seems more immature than not saying the naughty word to me.
Redditism 2: Ending a rebuke with a question mark when it's not a question to make it sound extra snippy.
I've heard this being compared to a "vocal fry" and maybe it is, and coming from CA, vocal fries were often said out loud as a form of subtle hostility toward people perceived as lessers, such as retail and restaurant workers. If you need an example of what I'm talking about, it usually goes something like this:
Poster: "I think (opinion)." 
Redditism enjoyer: "You're wrong?" 
Redditism 3: "Do you need help? Who hurt you? Help is available if you need it, buddy!" 
This one is the worst one I can think of right now because it contaminates even the very possibility of showing sincere care and concern for someone else. It comes loaded with the implication that the person that was "hurt" or "needs help" is fundamentally wrong and should shut up. Fuck that ableist shit, forever. 
I honestly don't care when people censor their swears. Honestly I think it can add something to written text depending on the context. It's like an exclamation point in the middle of a word.
What I cannot stand is people saying "it's ok to swear in the internet". No fucking shit. It's also ok not to swear on the internet you f*cking baby.
I think it's funny when someone censors a word that isn't normally considered a swear for comedic effect, like "Fr*nch".
That is quality, yes. Br***sh
that's fuinny but it's also way different than censoring a swear word because swearing is bad
that's your opinion and I disagree because I do care because I think it's dumb because I disrespect the entire notion of "swear words" as sacrosanct, inviolable constructs
I lost a job because I was swearing as an expression of my very human emotions of frustration and someone who was entirely unrelated to this, dozens of feet away, only overhearing these words, was so offended they reported me, and that is a culture I think must be erased from the earth (AND CENSORING SWEARS ONLINE IS A GATEWAY)
Is this an American thing? I've never seen the level of concern about 'swears' or 'cussing'
I assume it's not a Br*tish thing
I'm British and I swear like a sailor. I just don't care if someone chooses not to or chooses to use asterisks when they type it.