what do you do when your client thinks he/she has an "aesthetic

>>318104
pretty much the same you do with shitposters
provide some insightful and sound reasoning on why they are wrong from an objective point of view
if you succeed, client should stand corrected and actually start appreciating your work.

>>318105
I agree with this. However in the end its the clients opinion that counts.
If he likes his ideas and designs, try to working with them. You don't care about what you think looks good, you care about money and you are only gonna get that if the client thinks its good.

I can't count the number of times I sold logos and designs I wanted to shoot myself for to clients who were actually satisfied with my "work".
Downside is you cannot put these abominations into a portfolio, because everyone else they are horrible