No, you should not put crystal or glass dishes with a metal rack in the microwave. The combination of metal and microwaves can be dangerous and potentially cause fires or damage to the microwave and the dishes.
Microwaves work by emitting electromagnetic waves that excite water molecules in the food, causing it to heat up. Metal objects in the microwave can reflect and concentrate these waves, leading to sparks and possible fire hazards.
If the dish has a metal rack, it is best to remove the metal rack before microwaving the dish. Only use microwave-safe dishes and utensils that are explicitly labeled as microwave-safe to ensure safe and efficient cooking. If you're unsure about whether a particular dish is microwave-safe, it's best to avoid using it in the microwave altogether.