I stopped listening to him for the same reason. Unfortunately, both Sirius satellite radio and our local AM station carry his show at the same time during the afternoon, so when Mark Levin comes on, I switch to music or listen to a book on CD. No way am I going to listen to Levin's Never-Trump BS!
His defense of Trump since inauguration day has been magnificent, particularly with Spygate and his handling of Mike Flynn has been first rate.
I find people who smugly dismiss others even after they have changed are the ones who are truly offensive. Dismissive, arrogant, ugly and intolerant - you embody exactly how the democrats describe our side.
Your hate is your loss.