Probably all the more every time another sexuality gets lumped onto the juggernaut. Some people actually have these things called worldviews, which help them determine solidly what is right and what is wrong. Whether they are correct or not, many people find them to be necessary in order to make any claim regarding whether something (e.g. Homophobia) is bad or not. And so, whenever some new deviance, if you'll pardon the terminology, gets added to the LGBTQ+ lump some people will reveal that that's where they draw the line. If they ever (or already have? I don't watch the news very often) add zoophilia to their ranks, even people who see be problems with Homosexuality will decide that they can no longer support the movement. This may even lead them to wonder why they consider zoophilia so evil, and they will then discover that they do, in fact, have some basis that they have been using for their moral claims, be it Christianity, Islam, Hinduism, Buddhism, Judaism, etc. And then they may learn that the same moral basis with which they condemn zoophilia requires that they also condemn Homosexuality, and so they are forced to choose between accepting both or rejecting both, and thus they often choose to become Homophobic, the very thing they used to despise, in order that they not accept that thing that they consider even more abominable, Zoophilia. But that's just a theory.