I think the current situation makes it more and more difficult for schools and teachers to discuss reasonably-raised concerns reasonably , though.
When 9 out of 10 - or more - parent / teacher interactions involve parents being unreasonable, impolite, abusive, accusatory etc, then school’s default initial manner may well become more defensive even towards those whose complaints are reasonable. It’s like expecting an abused spouse to be instantly loving and kindly when the abuser is, for once, polite and reasonable.
Where emotions are heightened, and may well have led to generalised anxiety / fear / overwhelm, it can be really hard to respond perfectly.