They're not just unoriginal, obnoxious and offensive, they're historically inaccurate.
Back in the day, it was the pilgrims who drank beer all the time, simply because they had no reliable source of clean water. The indigenous Wampanoag people probably weren't in much of a partying mood, either, since were being decimated by novel diseases brought to their shores by the Europeans.
From a collection of native stereotyped American Thanksgiving ads at Indian Country. Thanks to Audra Williams for sharing.