You should never feel afraid to ask a sincere question to your Pastor/Spiritual Leader/Priest, etc.... Especially if you want clarification of what was said during their sermon. If they are offended, that's their problem, not yours.
Although, if was asked rudely or aggressively, then there might be a cause for concern, but you stated it was asked in a polite way.
In the New Testement, James writes: "If any of you lack wisdom, let him ask of God, that giveth to all men liberally and upbraideth not... (KJV - James 1:5)
To me, this excerpt seems to say, it's all right to ask questions, so you can get some answers, and if your Pastor/Leader can't help, then go Higher! Heavenly Father says he'll give you the answer....
Hard part is... the listening and being open to what He has in mind...
Also, if you're questioning, it means you're thinking of what is being presented and not just letting it wash over you. I hope this leads you to a good dialogue with your Pastor and I hope you find the answers you seek...