Has "queer" become a slur? Even as a part of the "LGBTQ+" moniker?
When it comes to LGBTQ it's not offensive - much like one can refer to legendary gangster rap group NWA by their chosen abbreviation, even if the N stands for a word you wouldn't use in polite company.
[1] https://www.npr.org/sections/publiceditor/2019/08/21/7523303...
In the case of "queer", it seems that even straight people somehow got to reclaim it, everybody is throwing it around, and that a large number of gay people don't like it at all.
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[*] Between black people it's usually more about telling somebody they're full of themselves. From white people to black people, empirically, it has almost always been followed with a murder threat.