May's main objection centres on Eavis's support for badger culling, an issue the animal rights activist and co-founder of Save Me vehemently opposes.
Eavis, a dairy farmer, has previously criticised May, calling him a 'danger to farming' for his opposition to the cull, which is intended to control bovine tuberculosis.
May has also previously mentioned Eavis's frequent insults as a reason for not performing, stating in 2019 that significant changes would be required.
Despite Queen + Adam Lambert having toured worldwide since 2012, the band has never graced the Pyramid Stage, and May remains uncertain about their future live appearances.