Well, they don't even know what the mechanics actually was, so how did they make that determination besides just blind rejection, binning, and labelling it as not serious?
I mean, if this is defendable, then there's all kinds of things that I could say about you, your play, the games you like, etc, that require nothing more than an offhand statement you've made that I've imagined the rest of for myself and made a judgement on. Like, say, your games are nothing more than playing Mother-May-I because you have the GM having to approve PC actions. I mean, that's silly, but here we are, with about the same level of imagination. Do you feel that me just saying that what you play is just Mother-May-I would be something you'd not feel I was being demeaning or insulting about?