This is a great discussion. I'm relatively newly out- about 3 years- so perhaps my perspective just stems from inexperience. I can honestly say, though, that I've never personally been made to feel inferior, or "not femme enough" by another femme, not once. The femmes I've met have been unfailingly gracious, welcoming me to the club
Online, I suppose I have seen a fair amount 'ewwww'-ing going on about any sort of sexual interest, on the part of either butches or femmes, that doesn't quite adhere to gender stereotypes. Perhaps, though, this is improving over time? I'm not certain of it, but I get the sense that maybe this was a bit more common a few years ago than it is today, thank goodness- probably thanks to folks' speaking up about it in threads like this.