Well. I did a bit of digging here, and I think I understand what is actually going on.
Now before I go any further, I need to make something very clear here. I do not speak with anger or vitriol. If you've seen enough of my posts on this site, you probably already know this. Nothing I say is an attack.
If you understand that, then let's keep going.
Again, I did a bit of digging. Reddit tracks posts and general behavior on each account... not exactly hard to do. Certain patterns quickly became apparent.
This situation has nothing to do with "stalkers", not in the way you're thinking of it. Dont get me wrong, some of their actions are certainly problematic, but it's not the core of the issue here.
I'll be blunt: The core of the issue is the things you say to others, and the fact that you dont quite seem to grasp the gravity of whatever it is you've said or done. Something quite venomous is said, but the fact that it IS venomous seems to go unnoticed by you. Unfortunately for you, everyone else does notice, and it seems that over time you gained some... notoriety on that forum. Which suggests that this has been going on for quite awhile. I suspect now, considering all of this and your many posts on this forum (which also display certain patterns), that this doesnt just apply to your words, but to your actions as well (as in, stuff not done online). This may tie into why your father got so very angry. Not that he was correct in doing so... he should have controlled himself. But still.
There's a bit more to it than just that... again, I dug fairly deep here... but that's the basics.
The point is, you speak and act without moderating what you're saying or doing. There seems to be a genuine lack of control here, but also, a lack of understanding the potential impact and effects of your actions, while at the same time not quite listening to those who give some form of feedback. That part may be some of why you seem to have trouble in understanding WHY a given situation is happening to you. There's a high chance that the reason for any given situation is right there, but somehow, you arent seeing it.
Here's the thing though: These behaviors arent exactly uncommon, when it comes to those on the spectrum. This is EXACTLY the sort of stuff alot of us arent any good at.
But if you want to stop getting into these situations, and if you want more control over your life as a whole, you're going to have to work on this issue. Instead of wondering why someone is attacking you in a given situation, it's time to start analyzing your own actions as well.
And you know what? That's what THIS forum is for. If you want to start dealing with this issue, you're in the right place, to get help. But you have to really listen, and not assume that anything is an attack. Nobody on this forum would do that (well, nobody I've seen, anyway). But even though we try to help, we cant fix things for you. If you want things to change, YOU have to make the change. That's how it works.
And that's it. That's the situation.
Now, as for Reddit itself... I'd strongly suggest destroying whatever accounts you're using there. They've simply gained too much traction. Hit a certain point of infamy in a place like that, and it simply wont wear off, period.
But also... there's certain places you should seriously be avoiding. Dont go into political subreddits or topics, for instance. Or places where arguements are sort of guaranteed. Stick to more "calm" topics for now. But again, with a new account. Try not to post too often, and dont do the "ask for help" posts on there. I suspect that those who already dislike you will spot you simply based on you making that type of post. When you want to ask for assistance with something online... use this forum instead. Remember: This forum, the entire site, exists for that reason. Reddit does not.
Again, nothing I say here is meant as an attack. I am simply trying to bring the actual problem to your attention. After all, if you dont know what the problem is, how can you fix it?
Myself and others can certainly try to help you, here on this forum, but again: in the end, it has to be YOU making the changes. You CAN do it, if you put your mind to it.