I made !pleasantpolitics for this exact reason. I wouldn't describe the influx of shit opinions as exclusively conservative, but it's definitely an influx, and it definitely requires some type of different reaction than the four unsatisfying horsemen of blocking, defederating, replying to each one until your fingers start to hurt, or seething silently. And every so often having a moderator delete one explicitly racist comment isn't the answer.
The model I am trying to make is that if you're consistently getting downvotes from trusted members of the community, out you go. The theory is that that will make the whole thing less excruciating. You can look more about it at !santabot. I don't know if it it going to work. But something must be done.
Edit: Fixed the link. There is no Pleastant Politics.