Last I checked being a furry does not mean you have to have a sexual attraction to animals. It's just a person that likes anthropomorphic animal characters.
And as someone who has been around furries for over 10 years, I can tell you that ANY furry who says it's "not about sex/porn" is bullshitting you. With 100% certainty.
In the case of Splatoon 2's plaza posts it's fine.
Shoving anthro animals into plaza posts is "fine" ? They're completely and totally unrelated to Splatoon.
It's perfectly okay if you don't share the same interest but that should never be a reason for hatred towards someone.
For the 3rd time now, I don't hate furries for being furries, I hate them because they never shut up about being furries and have to constantly tell everyone that they're furries.