I'd say that Florges isn't in the Human-Like egg group because it doesn't look as human as many of the other Pokemon in that egg group. All of the Pokemon in the Human-Like egg group have legs of some sort, but, unlike humans, Florges does not have legs. Florges also has a very large head/hair and two large "petals" at the bottom of it, which cause it to look less like a human. Many of the Pokemon in the Human-Like egg group also tend to do similar things that humans do. For example, many Pokemon in the Human-Like egg group that are Fighting type use similar fighting techniques that humans have developed, such as Sawk using karate. However, in the end, I guess that the only answer to this is that Florges isn't the in the Human-Like egg group because GameFreak didn't want to put it there.