It
is read into too much.
Mostly, because the games and comics kept that baseless idea firmly in popular culture references.
We saw the Queen having a natural aversion to flame, but it's possible that this is either an impulse genetically engrained by its more vulnerable 'facehugger days' or if, as I prefer to think, it's because it overloads their much higher developed sensory systems (which, incidentally, is the reason I suspect Newt's tracker might have been removed; her captor found it annoying).
More to the point, we saw the Nostromo's escape shuttle use high-temperature plasma thrust at very close range and the thing never showed in damage. Of course, I found it would have burst into flames in a vacuum, but still... There's just as much chance that it simply went into hibernation and is still floating out there, largely unharmed.
Eggs and facehuggers are fleshy. They seem flammable. Adult vulnerability is presently unknown.
I think it'd be rather iconic for a film to show one rushing through a torrent of flamethrower fuel, though... They already look like something which emerged from hell. Might as well add the as-much-at-home-in-an-inferno-or-ice theme.
