There's always 2 sides to a story. I can't say as an outsider I've felt HAL has been out to bully people. I could be wrong, I've been wrong before. So I'm not going to sit here to defend his character or to defame it. I know what bullies are like and know what it's like to be bullied, it ain't nice and I am of the opinion that no, I shouldn't have to ignore or avoid them. Yes, the difference here is, I could ignore someone and they couldn't bug me unless they were that persistent, to do that they'd either have to get you by email or create a sock puppet. If by email, you can automatically have any email sent by them sit in your junk folder. If creating a sock puppet, by this forum's rules they'd get banned. If you wanted it it's perfectly easy to get HAL out of your life. Though I don't agree that's what you should do - you might even be able to solve it like grown men...reasonable grown men
[1], but the option is there, especially if it becomes too much of a problem for you to deal with.
But is everybody who is seen to have bullied intentionally a bully? I don't think everybody I went to school with who I felt were bullying me actually hated me or wanted to pick on me. I ended up becoming friends with people I thought were picking on me, but in actuality they were joking around, thought what they were doing was a bit of fun and was not harming anybody. Heck my retorts might have been provocative, which escalated into 2 parties (me and this particular friend I'm thinking about) disliking each other and having conflict. To solve such a problem, it takes communication. The guy wasn't actually a bully, he was a nice guy. That doesn't mean every situation is like this, because I don't think this applied to everybody who made my life difficult at school.
The situation could be an analogy for what's happening here. HAL maintains he's not a bully, it could be he is one and he just won't admit it, because not many people like the idea of being considered a bully or it could be that he's right, he's not a bully, but he's doing things he wouldn't consider to be harming anybody.
To be honest, it's actually pretty difficult telling the two apart, because if a bully is pulled up on their bullying, they will use the same defence as somebody who isn't bullying, just so they seem innocent. I think as HAL is denying the accusation, what it's coming down to is how much you trust his honesty. Personally, I've considered him honest, I've never seen anything that would suggest that he's being dishonest here and if I was the one who felt bullied, I would be giving him the benefit of the doubt. But I don't see everything, nor do I notice everything, so I can't tell you the answer, but I've offered you my perspective on this.
I know there's been conflict between HAL and Nam, so I'm not completely oblivious to everything.

I didn't think anything of it until it was brought up really. I know certain members banter, so when I see sarcastic or even insulting remarks between peers, I just assume they're joking with each other.