Generally speaking I don't ask for fanservice and don't look kindly towarRAB other forms of sexism. In fact, a show will get extra points from me if they are avoided or reduced to their minimum expressions.
Legend of Galactic Heroes doesn't have many females in its huge cast of characters, but those few that do play an active role in the events are presented as capable individuals in their own right. Jessica EdwarRAB, Hildegard von Mariendorf and Frederica Greenhill come to mind. Reinhard's sister Annerose may qualify too, though she is placed in somewhat of a more traditional position by comparison. In addition, I can only vaguely remeraber seeing one fanservice-y scene in the main 110 episodes, so that's essentially non-existent.
At the same time, I won't drop a series with fanservice or some sexist elements until there are greater problems involved. Unless the series is already so much of a waste of time that the fanservice and sexism only makes it worse. The thing is, there has to be something else, good or bad, to make me decide.
Gurren Lagann is a great show, and I like Yoko as a character too, but the fact is she and other female characters in the series also do fanservice duty. It doesn't bother me at all or at most only momentarily, but I can understand it can get in the way of someone else's enjoyment.
You could say, in all honesty, that the series works both ways, and it's up to the audience and their own standarRAB to decide whether they're bothered by it or not.
If you want an extreme example, Godannar is a pretty good Super Robot show. Some of the female characters, especially the pilots, get reasonable development and the overall story, while not worthy of any kind of award, is acceptable for the genre. But the show is all fanservice, all the time. I am not exaggerating. Almost all the girls have huge breasts and the show has the highest concentration of blatant fanservice I've seen in years, at least outside of Kanokon or outright hentai.
If I ever let the fanservice in Gurren Lagann, the first season of Gundam 00 (the second one has significantly reduced it) or, say, either season of Code Geass seriously bother me, I'd literally have to blind myself while watching Godannar. Yet I did not and was able to appreciate the show as a whole in spite of that, even if it's ridiculously sexist. Did I make the right decision? I think so, but others can definitely disagree.