I tried different font settings in the font settings and it didn't improve much (font hinting, anti aliasing, custom DPI settings, different font size)
The font is the default one which is Ubuntu Regular with font size set to 10
Sub pixel order is set properly to RGB Linux Mint xfce
Even when running windows in a virtual machine, the font rendering in it is miles ahead of what I got on my Linux setup!!!
Infinality used to fix that aspect but the project died. Did you try deepin Linux distro? If I remember correctly it could handle fonts better than all other distros