(Also handy for puns. Your friend makes a bad joke? "Cutie, BYYYYYE!!!")
It sounds like TGIF: like a positive, celebrated thing.
It includes everyone.
It centers gender as our main axis of oppression, which is accurate: we're oppressed for our orientations because we're not following the gender rules.
If you're offended by people being included in the plus, what do you do with LGBTQ+ or LGBTQIPA+?
If you're only offended by putting GL there, why?
It's NOT a pronouncement that allies are oppressed/part of the community. They've always been the exception to the rule.
Partly, it's my reaction to the fact that LGBTQIPA+ is treated as if it's listed in order of importance. Very few of those groups have seen their rates of assault, suicidality, etc. get any better.