If I cut down my plane flight in half that means I'll take a plane every two years, meaning I'll also see my family half as much. You'd also have to include that, since I travel economy, you'd divide my contribution by ~350.
If Taylor Swift cuts her plane travel by half she'd "only" make 51 trips a year [1] on a plane that carries 12 and would still make more money in a year than what I'll see in my lifetime.
IMO, saying that both of us are contributing equally as much to global warming is just unfair.
[1] https://www.businessinsider.com/taylor-swift-spent-160-hours...