I spent the majority of my life in BC, but I've been away for the last 15 years.
BC, Quebec and the federal government have prevented further oil industry development while enjoying Alberta tax revenue from said oil industry. That's the basic gripe. And as far as I can tell, it's true.
The whole country is pro-oil now because we've realized we need to be stronger. This election cycle was drastically different compared to the last one which was completely about "climate change". Which was ridiculous imo.
Seperatism is bad, but being pro-Alberta is good. Being pro-Canadian oil and infrastructure development is good.
Every country needs to be taking climate change seriously for their own sake. Very few are. China is, and surprise surprise - China is outpacing western nations in a lot of different areas. Their rate of development is truly spectacular.
It's fun and games not to care, but the reality is economic prosperity is a long term game. You need to make decisions now that will decide 50 years from now. Oil is on the way out, it's the wrong horse to back for extremely expensive infrastructure.
If someone says "BC is Liberal" when discussing multiple provinces, they're probably referring to the distribution of federal MPs from BC. And in three of the last four elections including the most recent, the Liberals have "won" BC federally.