You missed my point. If "Blue" was a webcomic, would you put the "GL" tag on it? if there was such a convention? If you put "GL" on it, the sex becomes this point, but it shouldnt be the characters are.
The trailer doesn't warn you, its "GL", the point being, it's not afraid to depict reality without labeling (apoligizing) it before hand, it's presenting it self as a sex-positive work, without the sex being the point, the sex comments on the context, where if you lets say put a "GL" type logo in the front, or the sex becomes the point.
I actually saw the film, btw, its great, you should see it.
the film almost confronts haters: "Deal with it."
rather than apoligizing, advertising, warning its viewers of its sex content.
cause then the sex becomes the point, its porn now.
Edit: I see your point now, you think the trailer is the equivalent of a BL label, in the thumbnail...it's not tho, in my eyes at least writers are using BL as either underestimating their own ability to reach an audience with the BL content without the "BL" label, or, putting it cause they wanna make the best "BL" ever made. But you aren't going to trancend that BL ghetto, by branding yourself before hand.
And you have to deal with idiots, if you wanna change minds other than your targeted niche.