Other then LGBTQ+ not being a monolith? You can find any crazy opinion online. Difference is, one group is large enough to push to have the ten commandants hung in public school classrooms and the other is a fringe of a minority.
LGBTQ+ has their flags brought into educational institutions all across the U.S.
So? Not equivalent. There are deodorant ads also hung in the gyms of many schools. Do you feel threatened by the periodic table of elements or the multiplication table?
Pride flags are just to make lgbt kids feel welcome. If a cis student feels threaten by a pride flag, they have other issues.