I don't see what the problem would be with enjoying a wine tasting without drinking it, since it can be done by spitting.
When we tour the region's wineries to stock up on wine (this is where there are the most vineyards in France, and it's neither Bordeaux, nor Burgundy, nor Alsace), we spit instead of drinking, otherwise we wouldn't be able to visit more than one winery :)
But these are free tastings, just for amateurs and possibly buyers, so no cheese or charcuterie boards to accompany the wine like those in the paid wine tastings.
There's always a spittoon available, and that's how it's usually done.