Yes

Science and loads of peer reviewed studies point to vaccines being safe and working, they point to humans having a negative affect on the environment, and to trans people being valid in their transition. Science agrees with all of these points, people disagreeing with these studies and having a few outliers to point to when their studies are proven to be unsubstantiated or just clearly false is wrong.

It is a waste of time and resources, especially since there is already a general consensus around diversity.

I think the teachers already try their hardest to be inclusive ( which sometimes inclusivity gets to a riduculous point) and the teachers already train alot and they are there to teach not to be worrying about diversity.

The majority of "diversity training" frames being white as the oppressor, we should be moving towards a society that does not acknowledge race instead of celebrating one race specifically or degrading one race specifically. If we had no acknowledge meant of race this would make race seem irrelevant in all cases, which would lead to the eventual death of racism. In saying that racism would never completely go away, but the best we can do is focus on people for their merits, not the colour of their skin. Diversity training would only bring race to become a bigger subject, no racist would change their mind because of a diversity training course, but they potentially would if they could see no difference between black and white through the lack of acknowledgement and the lack of tension between races.