When someone speaks in the style of this guy — absolute certainty of the superiority of their chosen technology, dismissive of or glossing over its disadvantage

When someone speaks in the style of this guy — absolute certainty of the superiority of their chosen technology, dismissive of or glossing over its disadvantages, condescending to those who use or advocate other technologies — it makes me very dubious of their claims. It also makes me assume they’re trying to sell me something.