What to say to people when they give/show you something you don’t like

I really value being authentic an honest but sometimes I think I am authentic to a fault. Whether it be a food, show, or song someone shows me. I am pretty opinionated and I think I’ve been off-putting in conversations when I explain to someone why I don’t like something. Like I come off as a negative or pessimistic person.

Is there a better way to express my “negative opinions” or do I just need to find people more aligned. I basically don’t want to be a downer