Filou does not like too many people or animals around. He retires then and does not come outside as long as the people have not left (some of our friends are sad about that because they would love to pet him). His mother and dad however lived in a multi-cat household with 5 cats and some rabbits and adjusted well. His dad was the only not-spayed tom there -this must have been a reason why. And it was a really big former farmhouse. Another of the cats there was a Bengal who used to play ball with little Filou.
Filou however is polite: he says hello to everybody and gives a nosekissie to everyone who comes (even to my mom's dachshund Amber -but then he goes upstairs). I think I agree with Sallyanne.