I've long suspected that a bunch of people who are unhappy in their own lives or with a particular relative or boss but can't do anything about it have used Tannehill as a surrogate to get the poison out.
In their minds, they need to loudly trumpet that even in leaving, he hurt the team somehow. What the Fins got wasn't good enough (even thought they laughed at anyone who ever thought it possible for him to be traded) and somehow even THAT is Tannehill's fault.
For as much as some of them love to say "Hey, they can go to Tannehill's next team," I worry what they're going to do with all their free time. Maybe they'll go to Titans forums and start telling people what idiots they are over there.