It was completely warranted. My statement said "begin falling" meaning some time has passed. The person who corrected me took it further back in time, to t=0, which means no time has passed, but "begin falling" implies they've already started falling, and at the point they're falling, they fall faster in a vacuum than with air resistance.
It's the usual reddit pedantry and the guy you're defending was rude saying I don't have reading comprehension, when if you reread it all, it's the others who have misconstrued what I said. You're right though, I should have worded it better because I wasn't talking facts. I was more commenting on the original commentor not being as wrong as the second commenter made him sound.