They're being a pedant for no reason because there's a difference in definitions but the "modern era" began in the late 15th century.
https://en.wikipedia.org/wiki/Modern_era
You obviously used it in the more casual definition though.
They're being a pedant for no reason because there's a difference in definitions but the "modern era" began in the late 15th century.
https://en.wikipedia.org/wiki/Modern_era
You obviously used it in the more casual definition though.