Grilling does not mean BBQ. That said, the most emphatic BBQ die hards are in the south eastern US, and the different BBQ diehards of Texas. BBQ means slow roasted pork, either the shoulder, ribs, or whole hog. Smoke is almost always involved, but some try to get away with not smoking it. True BBQ is cooked with coals from burned down hard wood. Some try to use gas or even an oven. I admit, most of the time I put a rub on a shoulder then toss it into the oven to cook Low/Slow for hours, then shred it...but it’s not BBQ, Just slow roasted pulled pork.
In Texas, BBQ means slow roasted beef brisket, but you can also get sausage as well (German thing). I prefer western Carolina style vs eastern Carolina, and my ribs Memphis style. The Salt Lick BBQ joint near Austin (not the airport location) is a good example of Texas BBQ, but I preferred coopers in Llano from when I went there 10 years ago. Not sure if the quality is still up there or not, but it was good back then.
Grilling is burgers, shrimp (prawns), various sausages, steaks, chicken, chops, etc, stuff you cook hot and fast. That said, even in the BBQ wasteland that is northern Illinois, we know that grilling =/= BBQ