dogmatiser
/ˌdɒɡməˈtaɪzər, ˌdɔːɡ-/Definitions
1. noun
A person who habitually and emphatically declares their opinions and beliefs as absolute truths, often in a condescending manner.
“The dogmatiser’s views on politics were met with skepticism by the majority of the audience.”
2. verb
To declare or assert one’s opinions and beliefs as absolute truths in a condescending manner.
“He dogmatised his views on climate change, dismissing opposing views as irrelevant.”