Learn English – word for referring to yourself in the third person

A callithumpian

1836, U.S. colloquial, probably a fanciful construction at one time designating a society of social reformers, then in reference to "noisy disturbers of elections and meetings," and most commonly "a band of discordant instruments."

Actually paired adjectivally with chaos in stanza 84 of David Van Alstyne's 296-versed mouthful of a poem:

buccaneerishly galumphing into grievous garboils of chthonian uproar and terpsicoresan bedlam, and for gallivanting in great gyres of callithumpian chaos in a three-ring circus of near-simian agitation

Someone like you described could be feigning indifference (though this can also be used for a variety of reasons such as feigning indifference to being snubbed, being the subject of gossip, etc.):

feign /feɪn/ vb

1. to put on a show of (a quality or emotion); pretend: to feign innocence

2. (transitive) to make up; invent: to feign an excuse

3. (transitive) to copy; imitate

Etymology: 13th Century: from Old French feindre to pretend, from Latin fingere to form, shape, invent

indifference /ɪnˈdɪfrəns -fərəns/ n

1. the fact or state of being indifferent; lack of care or concern

2. lack of quality; mediocrity

3. lack of importance; insignificance