Let me say something as a japanese fans. At first my english isn't good enough so might sound rude/weird sometimes but I'm writing with respect to you guys and ayu.
I don't really know what tweet mede ayu upset. I found 2 different fans who were blocked right after they tweet. Those two tweets didn't mention about divorce at all. They were like "your cryptic tweets make us confused". Might be more sarcastic. But I don't think this could make her upset this much. And I actually understand their feelings. I guess some of fans are sick of her cryptic tweet after Maro. I'm not one of those fans but I totally understand why they tweet like this.
Since ayu gives us big love we easily misunderstand that we're close enough to tell what we really think (Yes this is something we have to keep in mind that we're not). In fact I once tweeted her that " I like you without too many eyelashes" I told her because I want her to know she's beautiful the way she is. And I know it's not my business at all and could be haters opinion, could be blocked if ayu was in a bad mood

I think those 2 were the same as I tweet. Just want her to know what I feel (and possibly want her to change... yes this could you to think we own her. Shame on me)
I only found those 2 tweets, there might be another divorce one or even worse tweet ayu had received, I don't know. But in my opinion those 2 don't deserved to be blocked.
As Chibi-chan said she's immature. Not mature enough to use twitter. It's sad but it'd be better use TA blog (because TA pays for that, no?)
Btw I think most of japanese fans never wish her divorce. Someone tweeted her "You're married and you post a photo in public of you in someone's arms look really happy, is your husband okay with this?" they even care about Tyson

or does this make her upset?
I don't know about the other culture but in Japan, this isn't common btw. We don't really take this seriously because it's ayu who likes to be in physical contact with boys but some people would think this is wrong or means something! (even though there's no need/right to tweet "divorce" on her tho) And the guy hugs ayu in the photo it seems like Subaru instead of Tyson. Not sure yet.