So if it becomes trendy to identify as animals should we treat it seriously too cuz a lot of people do and will be absolutely serious about it?

:(( That's already been a thing for years and the trans right activists take these people seriously (even have flags for them). For example some of them "identify" as "catgender" because they feel a strong connection with cats: https://lgbta.wikia.org/wiki/Catgender

They have other "genders" too like "beegender" where they "identify" as bees: https://beegender.carrd.co/#beegender

That's just the beginning, there are people called trans-specie or otherkin that believe they have "trans-specie dysphoria", and they are not human, but another specie: https://en.wikipedia.org/wiki/Otherkin#:~:text=Otherkin%20are%20a%20subculture%20who,soul%2C%20ancestry%2C%20or%20metaphor.

Otherkin are a subculture who socially and spiritually identify as not entirely human. Some otherkin claim that their identity is genetic, while others believe their identity derives from reincarnation, trans-species dysphoria of the soul, ancestry, or metaphor

Some otherkin know what they believe in is false and are just joking, but there are many otherkins I talked to that genuinely believe they are another specie and not human. And there are articles written about them and their experiences: https://www.vice.com/en/article/yvwknv/what-does-it-mean-to-be-trans-species

I think there are people that "identify" as things like food, and other things.

One of it is called robo-gender, they "identify" as robots, and think they are robots instead of human: https://xenogenders.carrd.co/#robogender

But I've seen some of these people genuinely believe they are things like crowns, chairs, statues, etc instead of human too.

Things are too far gone.