Canadian expat living in the UK here. Do not be so quick to dismiss these as bots.
I moved to London 6 months before the country shot itself in the ass with Brexit. Even days before the vote, literally everyone I spoke to in person and online agreed that Brexit was too stupid to happen, but my wife wasn't convinced. She'd been spending time on right wing subreddits, reading the misinformation and vitriol. She was convinced that Leave would win.
The day after the vote, two of my work colleagues proudly announced that they'd voted to leave.
Our social spheres are small, and despite (or perhaps also because of) the internet, typically insulated from people with whom we disagree. There are very likely more Leavers out there than you might think.
Alberta has had a deep "fuck Canada" streak for as long as I can remember. It's entirely plausible that at least some of these comments are from real idiots with real power to vote Leave, and we dismiss them at our peril.