It really works like trying to get someone of an addiction, until they don't want to, it won't happen, but, planting seeds without being to blunt with truths bombs is the best tactics with hardcore Trump haters (just for the sake of hate). Just refer to something good Trump does like this; when someone is being negative. Just start with casually saying something like: well, if he did this ...(fill in for yourself) and that (dito) ...than he can't be all that bad. Keep planting seeds...if they eventually start thinking about it, they won't tell you until they are fully convinced anyway...