I can see, however, how that might be an issue with a "dry snorkel" that has purge valves and do-dads on the top and that is mounted where the strap meets the mask frame, as is commonly seen.
I don't have a simple snorkel, but it's not terribly complex. I'm a pretty heavy biter, so I'm happy to have one that takes a normal reg mouthpiece. It does dangle on some flexible corrugated plastic, which is probably the bigger issue. Truth be told, it was the cheapest snorkel they had in the shop when I got certified, but I'm probably on my 5th mouthpiece in 2 years.