I think it's that whole morals thing that bothers libs the most.
It's not that liberals have no morals, but if they are thinking "relativistically"
then the moral principle being discussed or analyzed has to
(a) both apply to that person "personally" where it makes sense in their terms
(not just imposed from outside by some external source or influence)
(b) and also be "universal" for all people at the same time if you are going to argue
all people should follow it
It takes longer or more contextual backgrounds to explain and establish
a rule of law as "universal" to someone taking a relativistic approach, where the goal
is to be universal and specific at the same time, to accommodate diversity yet still
have unity without compromising one for the other.
The GOOD news is that once an understanding and agreement is reached, then that same
person will share that knowledge in a "relativistic way" with people of diverse backgrounds.
I go through this process all the time, because I relate to liberals
and have invested a lot of effort translating between conservative
principles and explaining them in liberal contexts to people who think outside the box.
It takes me longer to assimilate and align with people, but once we make those connections, then we can communicate and work across cultural political and religious lines so it is worth the extra effort it took to build to that point!