It's always interesting to notice two long-haul aircraft at adjacent gates, one just arrived, the other fuelled for departure, and the different wingtip heights. But actually, it's not a huge difference. The structural loads imposed by g-force in manoeuvering and turbulence, or assymetric landing where the main gear is attached to the wings, are greater.
And the propensity to "snap" is governed more than anything else by the wing design, simplistically how strong their structure is. Some aircraft have more robust designs than others. Did I say MD-11 ???
There's this unfortunate video of a total wings failure on a Hercules doing a fire retardant drop, at the point where there's a combination of sudden loading change and significant manoeuvring.