Our own software that we sell was crashing if you had a locale set in anything else than american english. The coworker who made that happen said I'm a weirdo

Our own software that we sell was crashing if you had a locale set in anything else than american english. The coworker who made that happen said I'm a weirdo for setting my machine in my own language. According to him I should have set it to english. This of course happened in a non english speaking country.