Personally, I think these are not suprising comments, especially if the individual did not have a good deal of experience dealing with non-Japanese. The first comment is typical of many Japanese. I am not saying they like drinking to excess, but many Japanese sarariman can't hold their liquor well and/or drink too fast and too strong of an alcohol.
The second comment sounds more like the kind of comment typically made in Japan in the spirit of I do nothing but work, all I have time to do is drink.
Anyway, I think it important that you let the individual know your expectations on the job, and that they avoid making such comments to non-Japanese clients. Beyond that keep an eye on them.