I’m relieved you allow that Trump did not start the trend. Has he been any worse than Senator Reid publically and repeatedly telling us that he had evidence that Romney cheated on his income taxes? (For all you low information voters, it was a bald lie.) If you take the slurs made today against Trump — racists, homophobe, etc. — you can find those same slurs made against Romney, probably to most honorable man to run for the presidency since Eisenhower.
Thing is, when Democrats have been using that kind of tactic so effectively against Republicans for so long, it’s kind of whiny for them now to complain that a Republican is finally turning the tables. Tit for Tat. Your complaint boils down to “he’s doing it harder against us than we were doing against them”.