It is not a pun, but reportedly began with UT students protesting WWII with a discussion over tea on the steps of the state capitol, insisting that, not war, was how civlized people resolve differences. Students rushing from Texas A&M (still a military academy at the time) to the front were impressed, but not favorably.

So it is no surprise folks who wanted to have tea with Hitler think a "respect" button will end trolling, but is typically naïve.