Labels? We all use them all day long... it is only SOME labels are more of an issue than others. And it ever so much depends on the person or group of persons that decides what is a 'taboo' (label) and what is not.
And so as you move from one -group's- conversational lexicon to another you best be prepared to get flamed quite often for not minding there specific label phobias/ taboo definitions.
To boot, some labels always will experience change, gay used to be happy, now it's queer..., geil (Ger.) used to be healthy and strong, now it is horny, fishy is mostly not quite OK i.e. it stinks, now in some trans circles it means VERY femme!, ->-bleeped-<-y has become the equivalent to cocky also in (some) trans circles. TG, GG, cis, even neo- as in neo-vagina, bio- as in bio-woman, all not OK; lesbian, dyke also having been reclaimed but not quite by every one group either, all can be taboo in some circles, the list goes on and on and on.
Now ask again: "Where do you draw the line?"
It very much depends with whom you converse and during which period of time.
Or... un-ask the question as there is no real answer as far as I can tell.
Axélle