@prologic, in the US it's various factors. This is my believe, based on my own observations, and it might not be accurate.

- I think hate has been latent, but set free by the past (and current running for) president, and exacerbated by the people that have taken over the Republican party. Trump, a "populist" leader, has used (and continues to use) nationalist rhetoric and scapegoating tactics (and lies!) to gain support. This has lead to an increase in intolerance, and a decline in civility. It truly is nuts!
- Trump and his allies has made their followers distrust traditional institutions like media and government, and driven them to fringe sources for information, which are rife with misinformation and hate speech.
- Prices going up, because of current world economy, and reasons outside the power of single entities (governments can't fix everything). In other words, economic insecurity has made people susceptible to scapegoating and blaming others for their problems, fuelling prejudice and hate.

Also, social media. Yes, that's right! Social media creates echo chambers, where people are only exposed to information that confirms (and reinforces!) their existing beliefs. This leads to increased polarisation and hostility towards people who have different viewpoints. Social media algorithms can also prioritise inflammatory content (you know it!), making it seem more prevalent than it is.

Maybe increase the amount of text we can type on twtxts? I am running out of space! :-)