Amphiprion (clownfishes )do have specific anemones that they generally host in the wild. Different types of clowns are from different regions and are exposed to different anemones. While Ocellaris will likelyhost a carpert anemone, it is not a good choice for a first anemone( very difficult to keep) . Further most carpet anemones are wild caught which make them even less likely to survive in anaqurium.
Entacmaea quadricolor (bubble tip anemone) are the easiest to keep and grow well in aquariums. Many are tank raised which make them an even better bet. Ocellaris are primarily tank raised so they have no natural exposure to anemones and may not select any of them. My mated pair of tank raised ocellaris host in a hammer coral (euphylia anchora) and my tomato clown pair (amphiprion ferenatus) host in a rose bubble tip anemone,err I mean 6 buble tip anemones. I started with one 5 years ago and have sold several and still have six. The will split in a healthy tank.
Wait at least six months;preferably a year. Anemones require a very stable tank. Don't get a real small one with full sized clowns . the clowns will buffet it to death.
I think someone should apologize for their disrespoectful attitude toward you. Sorry you had to put up with that.