sercgakisei is most likely another troll account. Although it is not inherently malicious, it seems to be quite offensive. Please stop supporting them.
This is exactly what I noticed about the account first as well. I didn’t post anything about this because as the OP here said, there didn’t seem to be anything inherently malicious about it and I can’t figure out what their motivations for this are. However, since the supposed narrative behind this is that he was “bullied off Tumblr by weeaboos for not speaking English”, I think it’s important to debunk this account as it provides untrue fodder for the legitimate reasons Japanophiles are terrible.