Should Obama remain vocal in politics after he leaves office, continuing to attack Republicans?

I did not vote for Donald Trump. I am not a Republican.

I see that Obama plans to remain in the limelight after he leaves office, and he plans to constantly attack Donald Trump and Republicans once he leaves office.

I think that's a bad decision and makes Obama look petty. Ford, Carter, Reagan, the Bushes and Clinton seemed pretty non-political once they left office and instead did typical Presidential things like charities (yes, I know the Clinton one wasn't normal).

Should Obama remain vocal and continue to attack Republicans once he leaves office? I think not.

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