To summarise so far then, this issue is about 2 things, boundaries in school (where they should be, how they should be enforced) and boundaries around adult communities.
Some parents are concerned about animal related behaviours demonstrated in their kids schools.
If schools are tolerating it, they should get a grip and enforce the boundaries around behaviour that kids need to feel and be safe.
I don't understand what the repeated assertion that this is 'all a hoax' achieves. Safeguarding is based on accurate risk assessment, not ignoring possible problems (that's not to say the possibility of problems should be exaggerated either).
No one is saying hoaxes don't happen.
No one is saying we should just believe things with no evidence.
There is evidence that several fandoms/subcultures including furries attract some less than savoury characters that it's not appropriate for children to mix with. There is a sexual side to some people's involvement in these subcultures.
That is not to say that everyone involved with these groups does it for sexual reasons but some clearly do.
Children may get attracted to these subcultures by the fun dressing up side.
Presenting it as 'all harmless fun' and suitable for children is therefore not accurate and parents are right to be concerned about their children's involvement in such things.
Normalising words like 'furry' is not a good idea as its helping to break down boundaries that help keep children safe. It's not safe for them to be involved in adult communities.
It's all about boundaries around what was previously considered to be adult behaviour. Identity politics and the Internet has allowed this to bleed into school life. Its difficult to see how ignoring this benefits children in any way.