Taking two snacks is perfectly fine. On LAA they are stocked with at least 2-3 snack baskets for a cabin of 16 people, which is usually enough for everyone to get at least 2.

The carry-on bag thing was not rude- although you might run into some flak from some FA's about asking for an "assist" as technically they don't have to lift any passenger bag. Looks like particular FA showed quick thinking by moving the guitar to the closet. It's a win-win for everyone ^