There are several Reddit threads discussing the red lipstick that Taylor Swift wears. Here are some of the responses:

• According to a post from 2019, a good red lipstick that Taylor Swift wears is Mac Retro Red in Ruby Woo.
• Another post from 2022 suggests that the poster loves Ruby Woo and thinks its the only red that looks good on them.
• A post from 2023 claims that Taylor Swift is wearing Pat McGrath LiquiLUST Lipstick in Elson 4 on tour.
• A post from 2014 mentions that Taylor Swift has said she wears MUFE Aqua Rouge lipsticks in #8 or #9.

It seems that Taylor Swift has worn different red lipsticks over the years, so there is no one definitive answer to this question.