No, it isn't

Yes, there are some people who do "wine tasting" just to get shitfaced. But if you go to any ACTUAL wine tasting (whether it is in the back of a Total Wine or at a fancy vineyard), basically everyone is expected to spit out the wine. Depending on the "methodology" you may swallow a small amount, but it is really like one sip per glass/wine.

And the person who does just chug each glass? This isn't Parks and Recs where everyone bows to the almighty prankster. They get their asses thrown out.

Now, whether people can tell the difference between six different syrahs whether they spit or swallow is a very different topic entirely. But if the goal is to get drunk, "wine tasting" is a horrible way to do it.

As for the why? Alcohol tends to deaden tastebuds. Wine and beer (and sake and the like) tend to be a low enough ABV with a high enough "flavor" level that ti tends to complement a meal. But the more you drink, the less nuance you can taste. Its (arguably) a big part of why the Japanese drink sake from small cups and hoity toity rich people tend to have staff refilling wine glasses to a fairly low level. The idea is you sip throughout the meal to complement the flavors without losing the ability to taste them.

It is also why you should IMMEDIATELY side eye anyone who encourages hard liquor as an accompaniment for a meal and raise an eyebrow if they are cooking with it for any delicate meals. So whiskey plus a slow cooked pork shoulder is one thing (and usually involves using a torch to burn off the alcohol at the start) whereas whiskey and a steak is a whole different one.