Smack someone with a goose, then smack them with a Mylar balloon. Compare the results.
You don't want to routinely ingest gravel from a dirt runway (nor balloons!) into your engines. Having one pebble kick up off the runway won't cause an issue.
You suggested an engine will "happily" consume a human which suggests it would continue functioning, you're getting blowback because you are making statements that indicate you don't know what you're talking about.
You don't want to routinely ingest gravel from a dirt runway (nor balloons!) into your engines. Having one pebble kick up off the runway won't cause an issue.