The 2019 Election was the Brexit election. The implosion of the Labour vote was a direct result of its incoherent messaging n Brexit and Jeremy Corbyn's reluctance to commit to becoming a Remain Party.
While accusations levelled against Corbyn over anti-Semitism within the Labour Party were damaging, they had almost no impact on the Labour vote share. Voters were happy to vote for the Conservative Party despite credible allegations of Islamophobia. This indicates that racism within the party was not a deciding factor in voters' decisions to back a party on election day.