I read comments like yours - "I'm not really a bad person, it was just a prank, Bro!" from time to time and I think it betrays a real lack of understanding on how human interaction works.
It is one thing to make a joke about fat people in some private setting among friends who know you and will take your words ironically. But to make the same joke in a public sub that was explicitly set up to ridicule fat people conveys a very different meaning. It means that you condone the sentiment behind the sub and agree with those users (perhaps a minority perhaps everyone else on there except you, who knows?) that do harbor malice towards others. By joining in you give such people strength and encouragement.
Reddit was right to ban those subs. You were wrong to participate.
(This doesn't make you a bad person in general, we all make mistakes.)
How is a sub dedicated to ridiculing fat people more like a public space than a private setting?
If you are chatting among friends in real life they can see your body language and hear your tone of voice. If someone takes offense you can immediately back-peddle.
Submitting a comment to a webpage (either public or protected) is more like writing graffiti on a public wall. Nobody knows or cares what your intentions were.
Not because you're racist or "antifatist."
But because it's fun?
Although you do consider those your political views (making fun of people for being black or fat)?
I'm confused.
And appalled.
Which, needless to say, is childish, wasteful of everyone's time on account of its disingenuousness, and doesn't reflect well on one's personal character or maturity.
That aside, even if most of the users "weren't taking it seriously" it creates the kind of environment where being hateful is tolerated and celebrated... not exactly the kind of community anyone should want to encourage or participate in.
More recent example:
https://livestreamfails.com/post/6039
For those who can't watch: A female streamer is playing PUBG when she is "downed" by other players. Said players then play the ISIS theme that has been played on ISIS execution videos over voice chat before shooting her character in the head. Are these players tolerating and celebrating ISIS or are they deliberately being offensive for humor? Or some other motivation?
For good reason people find this behavior objectionable, but at the same time I don't see how you're going to force people to stop doing things like this.
Please take some time to reflect and interpret other's comments charitably and arguing their strongest interpretation, not their weakest. It'll help you understand others better and make your own arguments stronger and contribute more productively.
Again, their statement was that if it involved pain then it was unacceptable. I pointed out boxing, they mentioned concentual. I pointed out that the user consented when they visited the URL.
I mean, come on... The two big ones were coontown and fatpeoplehate. What the hell did they think was going to be there?