As the name, Fine SCALE Modeler, would suggest, there is a direct correlation in size between a model and a real object, either extant or historical. For instance, a WWII Me-109 in 1:48 describes a copy of an aircraft scaled 1" on the model to 48" on what either is or once was, the real thing.
Many Sci-Fi models are NOT copies of any real vehicle, person, or what have you, as their name suggestsL: Science FICTION. So there has been the noted and understandable reluctance to feature them in a magazine devoted to SCALE models of "real" things. This has changed over time and nowdays ALL modelers are being welcomed, as it should be. It's simply that "scale fantasy" models (if there can BE such things) make up a rather small percentage of all the models being built out there. But rest assured, this is a confraternity we are a part of after all, regardless of our individual tastes. I think I speak for everyone when I say that your fellow Brothers in Modeling embrace you, regardless of what they think of your chosen subjects.
Are such things toys? Depends on your personal perspective. I personally think video games, as a whole, are stupid; a sheer waste of time. Yet many people devote much energy to them - normal, regular people. These "Gamers" imagine, from their point of view, that my lifftle models are also an equally frivolous waste of time.
There are many who are as "into" Gundams and other fantasy subjects as you are. Outlets exist for your creative efforts on the internet and in magazines devoted to these subjects, so there is room for you to "squeeze in." If you are really looking for an accomplice in this and lamenting the intolerance that others seem to have for your efforts - well, that is again a matter of your personal perspective, isn't it?
Modeling is intrinsically a personal experience, and it ulitmately matters only to you whether you think Gundams are toys or not. What difference can it possibly make if another thinks so, if you are happy with them?
"When we ask for advice, we are usually looking for an accomplice." - Marquis de la Grange (often mistakenly attributed to Saul Bellow.)