Sorry for the 
link but this isn't really picked up anywhere else. Predictably, the same disgusting people (referring to H3, Destiny, etc) who spread the dubious "Hasan shocked his dog" stuff don't care about this one, so it isn't all over the internet.
I'm not posting this to own everyone who said they like Hasan, but I do think it's an important thing to point out to any fans of his on this site that animal rights have always been a huge weak point for him. I'm a casual watcher who was tuning in for the China adventures, but 
so after the Panda zoo and this, I'm out for good.
Horse racing is such an obviously gross and abusive sport to anyone with sight to see it, so it's annoying seeing how many people (though admittedly in collapsed comments) in his community just don't care at all. Beyond the comments there, but in his chat in real time any time animal rights or veganism are mentioned.
Tangentially related, but 
s here should recognize that gacha slop like Uma Musume also funds horse racing (the franchise is basically PR for the Japan Racing Association) and is only a small separation from betting at the track. It was obnoxious seeing the wave of people talking about it at launch and seeing it plastered all over gaming sites, Steam, etc. Most people probably don't think twice about it because horse girls in anime just 'makes sense' in a vacuum, but I want to bring more attention to the cruel industry by using that franchise and Hasan as a springboard.
Please educate your favorite streamer, celebrity, or whoever so they don't use their platforms to promote animal abuse.
Edit: lmao their mods locked the thread that was significantly more supportive of the idea that races are abuse.
I understand all that and it means his first reaction to just about anything is to pull up the chatter and tell them to fuck off, as he did in this case. But I can't say that I've ever seen him publicly self reflect after the fact and change his mind either. This is something people have been trying to get him to pay attention to for years, before the recent all-out attacks. And I don't think people would be giving him the same leeway if this involved any other sort of ism than speciesism, which is also to be expected but disappointing.