This may be used as a derogatory tactic against altruists ("you're just virtue signalling"), especially by those who are non-cooperators.
ðɪs mˈeɪ biː jˈuːzd æz ɐ dᵻɹˈɑːɡətˌoːɹi tˈæktɪk ɐɡˈɛnst ˈɔːltɹuːˌɪsts"jʊɹ dʒˈʌst vˈɜːtʃuː sˈɪɡnəlɪŋ", ɪspˈɛʃəli baɪ ðoʊz hˌuː ɑːɹ nˈɑːŋkoʊˈɑːpɚɹˌeɪɾɚz.