Bottom line here is that there have been myriad experiments performed where no curvature can be found (where things that should be hidden behind thounsands of feet and even miles of curvature can be seen very clearly).
There are only two ways to address these --
1) claim that it's all fabricated or
2) assert "refraction"
In terms of fabrication, many of the long-distance photos that defy globe math were taken by pro photographers who are not FE and weren't considering the globe-shattering implications of their photos. Some were certified / validated by various organizations as having set various long-distance photography records. In addition, many of the experiments (including the most solid ones by Dr. John D) were announced beforehand, live-streamed, and witnesses were invited to participate. Finally, some of it would require CGI skills that are beyond the skills of the average video-maker and there are too many people who've made videos, taken photos, etc.
In terms of "refraction", light can bend downwards when it encounters increasing density (generally due to humidity, moisture in the atmosphere or, less so, except where it affects humidity, temperature changes). But two-way laser experiments performed in public by Dr. John D, wherein he also took meticulous measurements of humidity, temperature, etc. at several points along the way, completely debunk this phenomenon, since the lasers going in opposite directions were at the same elevation and just a few feet apart and with negligible humidity and temperature changes along the route that couldn't possibly account for "refraction". He also performed his experiments when it was relatively cold out and with low humidity to minimize any chances for atmospheric distortions. In order for refraction to work both ways, if there were a continually-increasing density in one direction, it would be continually decreasing in the opposite direction, causing the light to refract up, if anything, and not be visible. Finally, refraction simply cannot produce images with the clarity we see them from miles away, since you'd have to have an absolutely consistent rate of refraction the entire way. If during any part of these stretches of many miles the change of rate in terms of density were to change slightly, different things would refract into each other along the stretch and cause major distortion. Dr. John D made videos of various wind turbines at something like 6, 7, 8, and 10 miles from his vantage point and they all follow a consistent line that would result from perspective, without any distortion from refraction.
Unless some globe proponent could explain why the earth almost consistently tries to "hide" the alleged curvature using some other explanation where light would consistently bend exactly around the globe ... refraction is worthless, dead in the water, and an act of desperation for the globers to salvage their model, throwing the word out there without proof that it's actually taking place, combining that with begging the question.