Note that this is a bit of a straw man argument because the person you replied to didn't say "only" doing nice things makes you a good person. These are also ways to be a good person. The other is being a farmer, but only if you treat your staff and land and/or animals with respect and longevity in mind instead of capitalist exploitative min/maxing.

"Do no evil" is a good adage to live by, instead of "be a good person". In a lot of cases, doing nothing is the way to be a good person.