I don't even think this is true. Tbh, almost no one I know outside of the internet talks about RT scores or anything like that. I don't think movie going experiences have changed much. The majority of people who go to 3D movie screenings are just people doing it socially. My perception is that the more a person cares about RT scores or whatever, the more likely the person is someone who books IMAX 3D tickets a month in advance and wants to feel as hyped as possible before going into a film.
I actually hear it brought up quite a bit. It's never in a "this movie is objectively bad" sort of way, but when Batman V Superman came out we all sort of lost interest because of it.
It's not the specific score even. It usually just makes me more excited for a movie or tempers my expectations. I didn't expect anything out of Zootopia 2 months before but when I saw those RT scores being like 99% positive I became more excited for the weekend showing.
With Batman V Superman I canceled my ticket.