This question already has an answer here:
If an answer is grey after being downvoted so many times, why is it still allowed up top if it is selected answer.
To me that just speaks volumes of the ability of the OP to select a useful answer. Plus it just makes me scroll down more often.
Can we forgo the special position of a selected answer, if it is greyed?
My suggested solution is if a selected answer is grey, the top voted answer is placed above selected answer.
Another solution is to introduce a new sort option called standard. Standard is by votes with the selected answer at top. Sort by votes, is sort by votes, selected status has no priority.
Third solution. User option, hide greyed answers.