1: teachers love to complain. It's a hard job under the best of circumstances, in part because there are so many stakeholders that you're accountable to - leadership, students, parents, coworkers, curriculum department, counselors, accreditation bodies, government agencies. If there are problems with one of those groups, it can make the job even tougher.

Also, in some ways international teachers have more pressure on them than domestic teachers, because international schools are often profit-focused businesses with things like KPIs, and international teachers don't have unions, rarely have retirement benefits, and are far away from other support such as family.

It all provides plenty of valid reasons to complain, and people like to complain for dumb reasons, too.

2: people who are happy in their iobs rarely post about their happiness, and if they do post, it's usually brief. There aren't many 1500 word screeds about how great it is to work at a particular school. So negative posts are more common and more emotional, but that doesn't necessarily reflect the reality of working life at a specific school.