> I've met many people in coffeeshops, made friends, even been hit on fwiw
I don't think anecdotal evidence would be very convincing in this case, since your success (there has to be a better word for this) would largely depend on your percieved attractiveness and/or approachability. The setting might not play as big of a role as you think it does.
> I'm surprised you find it to be an insurmountable challenge.
I'm not GP but I didn't get that impression from their comment. I agree with them in that the meeting-people-at-coffeeshops is an overused cliche that was popularized by pop culture/media with lower chances of success.