There is a huge difference between offending others simply by sticking to your principles, and offending others needlessly just because it amuses you. Schlichter fails to recognize that distinction, and why it is so important.
Ronald Reagan navigated that distinction perfectly, and it was one of the reasons why he was so successful. He never backed off stating hard truths or sticking to his principles. But at the same time, he did not make it a habit to needlessly antagonize critical swing voters through his choice of language.
It was the Democrats who tried to eliminate that distinction when Reagan ran for office in 1980, by painting him as a mean, nasty, war-mongering guy. What was so critical about Reagan's debate performance is that he came across as a pleasant, normal guy, but never compromised on his conservative principles.
That turned out to be a winning combination with a majority of the country's voters. Because whether we like it or not, there are a significant number of voters who actually care more about the personality of the candidate than they do about policies. I suspect most of us here think that's pretty stupid, but that doesn't make the votes of those people count any less.
The issue is not trying to win over leftists who are going to hate us no matter how nice we are because they hate our policies and what we represent. The issue is trying not to needlessly alienate winnable swing voters just because it may amuse us to troll and offend the leftists.
A good recent example is how DeSantis has handled the transgender issue in Florida. He has come out very strongly against children being subjected to transgenderism, and specifically called out the use of the "euphemism" of "gender affirming care" to hide the fact that they were actually performing castrations, mastectomies, and sterilizations of children. That was a very strong, very direct, and completely non-compromising statement on transgenderism that greatly offended the left.
But at the same time, DeSantis did not mock or ridicule transgender people themselves, which would have served no useful purpose other than to amuse some conservative supporters. But it may have alienated some swing voters who otherwise agreed with DeSantis' argument. DeSantis stated hard truths, stuck to his guns on a very controversial issue, and still won by 19%.
I think that approach works far better than Schlichter's advocacy of rhetorical scorched earth.