Compound sentence: In situations of poor service, a segment of people tend to internalize their frustration, opting not to take any outward action. This sentence contains two main verb phrases, "tend to internalize" and "opting not to take", forming a compound sentence and increasing the complexity of the sentence.
Parallel structure: Essentially, they absorb the disappointment and choose to move past the incident without escalating it. This sentence uses a parallel structure, connecting two actions, "absorb the disappointment" and "choose to move past the incident", enhancing the expressiveness.
Participle structure: Reflecting a mindset of avoidance and acceptance. This is a participle structure used to describe the earlier mentioned "passive response", increasing the complexity of the sentence.
Noun phrase: a segment of people This is a noun phrase used to refer to a specific group of people, adding diversity to the sentence.