Wow, you must have worked in some REALLY toxic places. I had one toxic senior teammate when I first started out - he mocked me when I was having trouble with some of the dev environment he had created - but he got fired shortly thereafter for being bad at his job.

Everybody else through my 21-year career has almost universally either been helpful or neutral (mostly just busy). If you think code reviews are just for bikeshedding about style minutia, then you're really missing out. I personally have found it extremely rewarding to invest in junior SWEs and see them progress in their careers.