First of all, there are not normal people who f**k dogs.
Second, although they don't encourage beastiality, some members of the community do make content that is practically beastiality, or just sexualizes animals.
Third, if someone feels uncomfortable with something, they are within their right to hate it. It's not bullshit. Personal feelings should be validated.
I personally hate furries because I think they're an abomination for "worshipping" these animals. Animals are just like us, creatures who will die eventually. Furries dressing up as animals is just against nature. I personally wouldn't want to see a dog in a human costume. It's just grotesque.