1) Convincing insiders that they are wrong never works, because insiders do not care about being right or wrong, they care about staying inside and keeping others outside of "their funding".

2) Convincing outsiders works only with much simpler alternative. Occam's razor works for them:

• Sending a letter a day to yourself, but receiving a letter every other day just because day became twice faster/shorter = explains Hubble redshift, as received in faster time light has fewer waves in shorter second => drop in frequency = redshift;
• High school Snell's law for light refraction, as alternative to space bending;
• When time is not absolute, Newton’s laws should be adjusted; symmetry and conservation statements should be revised, not misinterpreted. With time dilation accounted, many mainstream delusions, like our world is not “locally real”, go away.