He has sometimes used satire for activism. The "Republic of Telly" sketch "Felix Bollard: A Serious Man" lampooned anti-LGBT rights campaigners' activities during the run-up to the marriage equality referendum of 2015 in Ireland. Along with fellow Irish comedian Tara Flynn, he wrote and starred in a video for LGBT Noise called "Armagaydon". The video had a swell of international support. As well as speaking out in favour of marriage equality, McGahern has also campaigned in favour of a "yes" vote in the 2018 abortion referendum.