ostentatiously

/ˌɑstənˈteɪʃəsli/
adverb
  1. In a way that is intended to attract notice or show off wealth, knowledge, or skill.
    • She ostentatiously flashed her diamond ring at the dinner table.
    • The billionaire ostentatiously parked his sports car right at the entrance.
    • He ostentatiously corrected the teacher's grammar in front of the whole class.