I see Brian Harvey has gone proper radio...

[Ganpati's Goonerz--AFC's Aboriginal Fertility Cult]

Careful, m. You're in danger of ascribing intellectual agency to Leave voters. There'll be someone along to tell you an anecdote about their sister-in-law that proves they're all idiots any minute.

Or one about their parents.

[Sir C]

Or one about their parents.

My parents didn't vote at all, but then they're pretty much brain dead anyway.

[Burney]

Or one about their parents.

I mentioned my parents' feelings as exemplifying the fact that there were many, many, many different reasons why people voted Remain. The specific purpose was to make clear that they were not symptomatic or emblematic of anyone else and that generalisations were idiotic.

Your anecdote, on the other hand, was explicitly about the only leave voter you knew and was meant to suggest that huge numbers of Leave voters were idiots who had no idea what they were doing. In fact, all it actually served to demonstrate was the narrow range of political opinion in your social circle. Echo chamber thinking, in other words.