First, its your glass and your booze, and you can use it any way you want. Snifters were, in my day, called brandy snifters, the idea being to swirl the brandy in the glass, then appreciate the aroma of the spirit. And while aroma is an important part of the scotch experience, most tasters seem to prize mouth feel, taste and finish over aroma. I have become fond of a Speyside single malt that is peated, and the first bottle I bought was packaged with two glasses. They were of course engraved with the distiller's name (Glen Moray), were shaped like what are often called stemless wine glasses, and held about 8 ounces. I enjoy sipping single malt from these glasses, but really, most blended scotches are better with ice, or even as a cocktail (with soda).
But really, if you ever serve me a good single malt in a big red cup, I'll be grateful for the sharing. Don't sweat the small stuff.