It's a shitty article, that uses shitty polling data.
What it means to be lib vs. con in different time periods and different countries is a complex question. I guarantee you that in absolute terms, white boys from the Midwest are much less racist than they were 40 years ago.
It misses the biggest swing from lib to conservative that happened, that older white women, without a college education, flipped to conservative, from consistently voting Democrat.
The article implicitly is trying to cast blame on young white boys, turning conservative, and therefore pushing the country into being regressive. It misses that the biggest regressive block are still the elderly white folk, and that that block is also the biggest voting block.
Bringing in cheap TFW also screws up the coffee/hospitality industry. Lots of local people would start their own coffee shop, serve sandwiches, it's not rocket science. But there is no way to compete with a company that brings in TFW. So you're left with bad food, and an unpleasant place to sit. Nowadays the shops are dirty and uncomfortable. Also cause high local unemployment, of people that could start a small business but it's not a fair playing field. Even if a local starts a coffee shop and fails, they learnt many valuable skills; accounting, permit applications, human resourcing. The coffee shop was a place to start for a local needing to make money and move up in life. That's why I hate places like Tim Hortons and Starbucks, and all the chains.
TFW should be brought in, but there should be a $50K application fee per worker per year, to insure that these jobs are for understaffed specialist positions.