> My point is that I have an issue with his tone and rhetoric, not with the thing he’s advocating.

This is often a hand wavy excuse by people who simply don’t agree with a cause and/or think it’s not important, but won’t admit it. If you don’t think what he is advocating for is important just say so. If you do, support him. You can’t possibly believe he’s so out of line that it’s worth prioritizing that opinion over the cause itself.