Why do some people provoke a fight but then get upset and plot revenge when they lose and are humiliated for it like trump?

Donald Trump can issue all the death threats he wants all the live long day and no one bats an eye but the moment a liberal and a democrat does it to him and implies all his supporters are the same then everyone gets mad and says how we should not generalize all of them but they can generalize liberals as being communist traitors. Why is there this double standard of liberals having to be civil but republicans are not?

Why do some people provoke a fight but then get upset and plot revenge when they lose and are humiliated for it like trump?
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