Will & Grace has consistently been called out for being biphobic and they seem to have done it again.
NBC released the synopsis of the episode airing February 6th which includes the following plotline:
Will and Grace decide to intervene when they discover Grace’s niece (guest start Billie Lourd) is dating a bisexual man.
This comes after the show not long ago erased Karen's history of bisexuality by making her "come out as straight." Also, the show has had a plot where one of the guys dates a bisexual man who is concurrently hooking up with one the girls *ensue laughter*
Now the plotline in the upcoming episode could be done tastefully to show the prejudice against bisexual people but the fact that this is even a plot in 2020 and seeing the history of this show, I am not counting on it.