This is quite true. When Reagan was president I was also more tactful. I am not as tactful today as when Reagan was president because I am filled with piss and vinegar due to marixsts and progressives and my everyday speech is not politically correct. I never altered my speech to conform to political correctness.
Part of Trump's lack of tactfulness is due to the lens of political correctness that most people have these days.
I think if you ran Trump's speech from tonight's Alabama rally back in 1979 Trump would not come off as untactful since there wasn't political correctness in 1979. That said, Trump's speech would not go over as well as a Reagan speech in 1979. Different times. My greatest hope about Trump is to end political correctness by Trump being Trump. Then we can get back to statesmanship without language police. I am all for tactful and civilized language. It won't happen until our nation shares a common language where some class of people are not offended by everyday speech. Until that day comes I will intentionally piss off liberals with my speech until they get used to it.