I see what you're doing, and it doesn't bother me all that much in this context. I think of image boards as being more of a dialogue, so intentional solecism makes sense to me here.
That's technically correct, but it's even more subtle than that. By intentionally leaving out who watched the anime in the opening clause, it's stressing the importance of the action over the person performing the action. I was a little drunk when I wrote that, so the explanation should have been
>>I'm a fucking blowhard and want to stress anime was watched.