All of us have mannerisms to some extent, Seemingly by compulsion, We habitually do certain peculiar things unconsciously for no apparent reason; we just keep on doing them. Mannerisms are not necessarily unpleasant or annoying to others. They may pass almost unnoticed, or even be subtly attractive as somehow an inseparable part of an individual personality. When they are conspicuous, however, they tend to distract attention, and when frequently repeated they may become insufferable.
Foley, L. (1971). What Goes Along With the Words. Reading Horizons: A Journal of Literacy and Language Arts, 11 (3). Retrieved from https://scholarworks.wmich.edu/reading_horizons/vol11/iss3/2