Love it. You posted images, they got reverse searched, showing that none of them were in an elementary school, so you think, "Ha, I'll post a video! They won't be able to identify the origins of videos!".
You wish.
0:00 Drag brunch in a restaurant. Not a kindergarten classroom.
0:09 Story telling at Barnstable and Bideford Libraries, in Devon, UK. Not a kindergarten classroom. We don't even call it kindergarten over here.
2:14 King County Library in Washington State. Not a kindergarten classroom.
2:18 Park Slope branch of Brooklyn Public Library again. It still isn't a kindergarten classroom.
2:30 El Museo del Bario in Harlem, but to be fair, it was part of an NYC school talent show, with the PTA president being the performer in question. The NYC Department of Education stated it was inappropriate and the school administration spoke with the parent (https://abc7ny.com/drag-nyc-schools-education-department-of/2062608/). Still not a kindergarten classroom, and still not something routinely happening, obviously.
There are literally zero examples of elementary school libraries in that video. Give that up already.
But the real question is why did you think there were? Why do a whole bunch of people think that, when it's clearly not actually a thing? And it's the same answer it always is; people get inflamed about it through inflammatory rhetoric, not the reality. But people voluntarily taking their own children to a reading event at a public library isn't really something you think you'd be that mad about, even if a person in drag is doing the reading, so there's a cognitive dissonance between the outrage people feel over it and the actual reality.
So to resolve that dissonance, people tend to go one of two ways; they decide they actually are mad about people taking their own kids to events, or, they assume the reality must match the outrage they feel.
That is, they think it must be happening in elementary school libraries, because otherwise they wouldn't be so mad about it. Then they insist publicly it is happening, and get frustrated when they're unable to show it, because it isn't.
The other way to resolve it is to recognise the reality and stop being so mad about it. But some people have trouble with that too, because their self-image is of someone who couldn't fall for inflammatory rhetoric and outright lies in the first place.
And meanwhile, the continuing desire of some to create that outrage and stoke hatred with inflammatory rhetoric and lies in the first place is why we still need Pride month.