Nothing to do with lasers, but in East Malaysia, it's considered a major coup by the local teenage (and younger) boys if they can snag their kite string on an airliner on approach. (And it's not unusual to see lots - and I mean LOTS - of kites around the East Malaysian airfields.)
On the pre-flight walkaround, (I think it was at Kota Kinabalu, but it may have been Kuching), I once found a very long piece of red string draped over the leading edge of my aircraft, so at least one kid had scored a 'hit'.
If the kite itself was to be ingested by the engine, I don't suppose it would cause any major damage, (to the engine at least - it would be severely 'terminal' for the kite), but neither is it something the airline's engineering department would want to encourage.